diff --git a/modules/@angular/compiler/src/aot/compiler_factory.ts b/modules/@angular/compiler/src/aot/compiler_factory.ts
index 36a2ad2c42..9975018128 100644
--- a/modules/@angular/compiler/src/aot/compiler_factory.ts
+++ b/modules/@angular/compiler/src/aot/compiler_factory.ts
@@ -77,7 +77,8 @@ export function createAotCompiler(compilerHost: AotCompilerHost, options: AotCom
   const importResolver = {
     getImportAs: (symbol: StaticSymbol) => symbolResolver.getImportAs(symbol),
     fileNameToModuleName: (fileName: string, containingFilePath: string) =>
-                              compilerHost.fileNameToModuleName(fileName, containingFilePath)
+                              compilerHost.fileNameToModuleName(fileName, containingFilePath),
+    getTypeArity: (symbol: StaticSymbol) => symbolResolver.getTypeArity(symbol)
   };
   const compiler = new AotCompiler(
       compilerHost, resolver, tmplParser, new StyleCompiler(urlResolver),
diff --git a/modules/@angular/compiler/src/aot/static_symbol_resolver.ts b/modules/@angular/compiler/src/aot/static_symbol_resolver.ts
index 7d5e447d80..0485b5c767 100644
--- a/modules/@angular/compiler/src/aot/static_symbol_resolver.ts
+++ b/modules/@angular/compiler/src/aot/static_symbol_resolver.ts
@@ -10,6 +10,7 @@ import {SummaryResolver} from '../summary_resolver';
 import {ValueTransformer, visitValue} from '../util';
 
 import {StaticSymbol, StaticSymbolCache} from './static_symbol';
+import {isNgFactoryFile} from './util';
 
 export class ResolvedStaticSymbol {
   constructor(public symbol: StaticSymbol, public metadata: any) {}
@@ -83,6 +84,15 @@ export class StaticSymbolResolver {
     return result;
   }
 
+  /**
+   * getImportAs produces a symbol that can be used to import the given symbol.
+   * The import might be different than the symbol if the symbol is exported from
+   * a library with a summary; in which case we want to import the symbol from the
+   * ngfactory re-export instead of directly to avoid introducing a direct dependency
+   * on an otherwise indirect dependency.
+   *
+   * @param staticSymbol the symbol for which to generate a import symbol
+   */
   getImportAs(staticSymbol: StaticSymbol): StaticSymbol {
     if (staticSymbol.members.length) {
       const baseSymbol = this.getStaticSymbol(staticSymbol.filePath, staticSymbol.name);
@@ -98,6 +108,25 @@ export class StaticSymbolResolver {
     return result;
   }
 
+  /**
+   * getTypeArity returns the number of generic type parameters the given symbol
+   * has. If the symbol is not a type the result is null.
+   */
+  getTypeArity(staticSymbol: StaticSymbol): number /*|null*/ {
+    // If the file is a factory file, don't resolve the symbol as doing so would
+    // cause the metadata for an factory file to be loaded which doesn't exist.
+    // All references to generated classes must include the correct arity whenever
+    // generating code.
+    if (isNgFactoryFile(staticSymbol.filePath)) {
+      return null;
+    }
+    let resolvedSymbol = this.resolveSymbol(staticSymbol);
+    while (resolvedSymbol && resolvedSymbol.metadata instanceof StaticSymbol) {
+      resolvedSymbol = this.resolveSymbol(resolvedSymbol.metadata);
+    }
+    return (resolvedSymbol && resolvedSymbol.metadata && resolvedSymbol.metadata.arity) || null;
+  }
+
   private _resolveSymbolMembers(staticSymbol: StaticSymbol): ResolvedStaticSymbol {
     const members = staticSymbol.members;
     const baseResolvedSymbol =
@@ -134,6 +163,7 @@ export class StaticSymbolResolver {
    *
    * @param declarationFile the absolute path of the file where the symbol is declared
    * @param name the name of the type.
+   * @param members a symbol for a static member of the named type
    */
   getStaticSymbol(declarationFile: string, name: string, members?: string[]): StaticSymbol {
     return this.staticSymbolCache.get(declarationFile, name, members);
diff --git a/modules/@angular/compiler/src/aot/summary_serializer.ts b/modules/@angular/compiler/src/aot/summary_serializer.ts
index b2481c696e..6bf3011dd8 100644
--- a/modules/@angular/compiler/src/aot/summary_serializer.ts
+++ b/modules/@angular/compiler/src/aot/summary_serializer.ts
@@ -94,10 +94,10 @@ class Serializer extends ValueTransformer {
   addOrMergeSummary(summary: Summary<StaticSymbol>) {
     let symbolMeta = summary.metadata;
     if (symbolMeta && symbolMeta.__symbolic === 'class') {
-      // For classes, we only keep their statics, but not the metadata
+      // For classes, we only keep their statics and arity, but not the metadata
       // of the class itself as that has been captured already via other summaries
       // (e.g. DirectiveSummary, ...).
-      symbolMeta = {__symbolic: 'class', statics: symbolMeta.statics};
+      symbolMeta = {__symbolic: 'class', statics: symbolMeta.statics, arity: symbolMeta.arity};
     }
 
     let processedSummary = this.processedSummaryBySymbol.get(summary.symbol);
@@ -106,11 +106,11 @@ class Serializer extends ValueTransformer {
       this.processedSummaries.push(processedSummary);
       this.processedSummaryBySymbol.set(summary.symbol, processedSummary);
     }
-    // Note: == by purpose to compare with undefined!
+    // Note: == on purpose to compare with undefined!
     if (processedSummary.metadata == null && symbolMeta != null) {
       processedSummary.metadata = this.processValue(symbolMeta);
     }
-    // Note: == by purpose to compare with undefined!
+    // Note: == on purpose to compare with undefined!
     if (processedSummary.type == null && summary.type != null) {
       processedSummary.type = this.processValue(summary.type);
     }
@@ -147,7 +147,7 @@ class Serializer extends ValueTransformer {
     if (value instanceof StaticSymbol) {
       const baseSymbol = this.symbolResolver.getStaticSymbol(value.filePath, value.name);
       let index = this.indexBySymbol.get(baseSymbol);
-      // Note: == by purpose to compare with undefined!
+      // Note: == on purpose to compare with undefined!
       if (index == null) {
         index = this.indexBySymbol.size;
         this.indexBySymbol.set(baseSymbol, index);
diff --git a/modules/@angular/compiler/src/aot/util.ts b/modules/@angular/compiler/src/aot/util.ts
index 60e3347f10..4285f805ec 100644
--- a/modules/@angular/compiler/src/aot/util.ts
+++ b/modules/@angular/compiler/src/aot/util.ts
@@ -7,6 +7,7 @@
  */
 
 const STRIP_SRC_FILE_SUFFIXES = /(\.ts|\.d\.ts|\.js|\.jsx|\.tsx)$/;
+const NG_FACTORY = /\.ngfactory\./;
 
 export function ngfactoryFilePath(filePath: string): string {
   const urlWithSuffix = splitTypescriptSuffix(filePath);
@@ -14,7 +15,11 @@ export function ngfactoryFilePath(filePath: string): string {
 }
 
 export function stripNgFactory(filePath: string): string {
-  return filePath.replace(/\.ngfactory\./, '.');
+  return filePath.replace(NG_FACTORY, '.');
+}
+
+export function isNgFactoryFile(filePath: string): boolean {
+  return NG_FACTORY.test(filePath);
 }
 
 export function splitTypescriptSuffix(path: string): string[] {
diff --git a/modules/@angular/compiler/src/output/output_ast.ts b/modules/@angular/compiler/src/output/output_ast.ts
index 0daf19705c..31e5d556f2 100644
--- a/modules/@angular/compiler/src/output/output_ast.ts
+++ b/modules/@angular/compiler/src/output/output_ast.ts
@@ -44,11 +44,7 @@ export class BuiltinType extends Type {
 }
 
 export class ExpressionType extends Type {
-  constructor(
-      public value: Expression, public typeParams: Type[] = null,
-      modifiers: TypeModifier[] = null) {
-    super(modifiers);
-  }
+  constructor(public value: Expression, modifiers: TypeModifier[] = null) { super(modifiers); }
   visitType(visitor: TypeVisitor, context: any): any {
     return visitor.visitExpressionType(this, context);
   }
@@ -881,13 +877,12 @@ export function importExpr(id: CompileIdentifierMetadata, typeParams: Type[] = n
 export function importType(
     id: CompileIdentifierMetadata, typeParams: Type[] = null,
     typeModifiers: TypeModifier[] = null): ExpressionType {
-  return isPresent(id) ? expressionType(importExpr(id), typeParams, typeModifiers) : null;
+  return isPresent(id) ? expressionType(importExpr(id, typeParams), typeModifiers) : null;
 }
 
 export function expressionType(
-    expr: Expression, typeParams: Type[] = null,
-    typeModifiers: TypeModifier[] = null): ExpressionType {
-  return isPresent(expr) ? new ExpressionType(expr, typeParams, typeModifiers) : null;
+    expr: Expression, typeModifiers: TypeModifier[] = null): ExpressionType {
+  return isPresent(expr) ? new ExpressionType(expr, typeModifiers) : null;
 }
 
 export function literalArr(values: Expression[], type: Type = null): LiteralArrayExpr {
diff --git a/modules/@angular/compiler/src/output/path_util.ts b/modules/@angular/compiler/src/output/path_util.ts
index b80d861382..bc262193da 100644
--- a/modules/@angular/compiler/src/output/path_util.ts
+++ b/modules/@angular/compiler/src/output/path_util.ts
@@ -24,4 +24,9 @@ export abstract class ImportResolver {
    * to generate the import from.
    */
   abstract getImportAs(symbol: StaticSymbol): StaticSymbol /*|null*/;
+
+  /**
+   * Determine the airty of a type.
+   */
+  abstract getTypeArity(symbol: StaticSymbol): number /*|null*/;
 }
diff --git a/modules/@angular/compiler/src/output/ts_emitter.ts b/modules/@angular/compiler/src/output/ts_emitter.ts
index 1cddf917eb..cfc6817ac7 100644
--- a/modules/@angular/compiler/src/output/ts_emitter.ts
+++ b/modules/@angular/compiler/src/output/ts_emitter.ts
@@ -21,7 +21,8 @@ export function debugOutputAstAsTypeScript(ast: o.Statement | o.Expression | o.T
     string {
   const converter = new _TsEmitterVisitor(_debugFilePath, {
     fileNameToModuleName(filePath: string, containingFilePath: string) { return filePath; },
-    getImportAs(symbol: StaticSymbol) { return null; }
+    getImportAs(symbol: StaticSymbol) { return null; },
+    getTypeArity: symbol => null
   });
   const ctx = EmitterVisitorContext.createRoot([]);
   const asts: any[] = Array.isArray(ast) ? ast : [ast];
@@ -65,6 +66,8 @@ export class TypeScriptEmitter implements OutputEmitter {
 }
 
 class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor {
+  private typeExpression = 0;
+
   constructor(private _genFilePath: string, private _importResolver: ImportResolver) {
     super(false);
   }
@@ -74,7 +77,9 @@ class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor
 
   visitType(t: o.Type, ctx: EmitterVisitorContext, defaultType: string = 'any') {
     if (isPresent(t)) {
+      this.typeExpression++;
       t.visitType(this, ctx);
+      this.typeExpression--;
     } else {
       ctx.print(defaultType);
     }
@@ -149,6 +154,17 @@ class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor
     return null;
   }
 
+  visitInstantiateExpr(ast: o.InstantiateExpr, ctx: EmitterVisitorContext): any {
+    ctx.print(`new `);
+    this.typeExpression++;
+    ast.classExpr.visitExpression(this, ctx);
+    this.typeExpression--;
+    ctx.print(`(`);
+    this.visitAllExpressions(ast.args, ctx, ',');
+    ctx.print(`)`);
+    return null;
+  }
+
   visitDeclareClassStmt(stmt: o.ClassStmt, ctx: EmitterVisitorContext): any {
     ctx.pushClass(stmt);
     if (ctx.isExportedVar(stmt.name)) {
@@ -157,7 +173,9 @@ class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor
     ctx.print(`class ${stmt.name}`);
     if (isPresent(stmt.parent)) {
       ctx.print(` extends `);
+      this.typeExpression++;
       stmt.parent.visitExpression(this, ctx);
+      this.typeExpression--;
     }
     ctx.println(` {`);
     ctx.incIndent();
@@ -299,11 +317,6 @@ class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor
 
   visitExpressionType(ast: o.ExpressionType, ctx: EmitterVisitorContext): any {
     ast.value.visitExpression(this, ctx);
-    if (isPresent(ast.typeParams) && ast.typeParams.length > 0) {
-      ctx.print(`<`);
-      this.visitAllObjects(type => type.visitType(this, ctx), ast.typeParams, ctx, ',');
-      ctx.print(`>`);
-    }
     return null;
   }
 
@@ -346,17 +359,24 @@ class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor
     }, params, ctx, ',');
   }
 
-  private _resolveStaticSymbol(value: CompileIdentifierMetadata): StaticSymbol {
+  private _resolveStaticSymbol(value: CompileIdentifierMetadata):
+      {name: string, filePath: string, members?: string[], arity?: number} {
     const reference = value.reference;
     if (!(reference instanceof StaticSymbol)) {
       throw new Error(`Internal error: unknown identifier ${JSON.stringify(value)}`);
     }
-    return this._importResolver.getImportAs(reference) || reference;
+    const arity = this._importResolver.getTypeArity(reference) || undefined;
+    const importReference = this._importResolver.getImportAs(reference) || reference;
+    return {
+      name: importReference.name,
+      filePath: importReference.filePath,
+      members: importReference.members, arity
+    };
   }
 
   private _visitIdentifier(
       value: CompileIdentifierMetadata, typeParams: o.Type[], ctx: EmitterVisitorContext): void {
-    const {name, filePath, members} = this._resolveStaticSymbol(value);
+    const {name, filePath, members, arity} = this._resolveStaticSymbol(value);
     if (filePath != this._genFilePath) {
       let prefix = this.importsWithPrefixes.get(filePath);
       if (isBlank(prefix)) {
@@ -372,10 +392,28 @@ class _TsEmitterVisitor extends AbstractEmitterVisitor implements o.TypeVisitor
     } else {
       ctx.print(name);
     }
-    if (isPresent(typeParams) && typeParams.length > 0) {
-      ctx.print(`<`);
-      this.visitAllObjects(type => type.visitType(this, ctx), typeParams, ctx, ',');
-      ctx.print(`>`);
+
+    if (this.typeExpression > 0) {
+      // If we are in a type expreession that refers to a generic type then supply
+      // the required type parameters. If there were not enough type parameters
+      // supplied, supply any as the type. Outside a type expression the reference
+      // should not supply type parameters and be treated as a simple value reference
+      // to the constructor function itself.
+      const suppliedParameters = (typeParams && typeParams.length) || 0;
+      const additionalParameters = (arity || 0) - suppliedParameters;
+      if (suppliedParameters > 0 || additionalParameters > 0) {
+        ctx.print(`<`);
+        if (suppliedParameters > 0) {
+          this.visitAllObjects(type => type.visitType(this, ctx), typeParams, ctx, ',');
+        }
+        if (additionalParameters > 0) {
+          for (let i = 0; i < additionalParameters; i++) {
+            if (i > 0 || suppliedParameters > 0) ctx.print(',');
+            ctx.print('any');
+          }
+        }
+        ctx.print(`>`);
+      }
     }
   }
 }
diff --git a/modules/@angular/compiler/test/output/js_emitter_spec.ts b/modules/@angular/compiler/test/output/js_emitter_spec.ts
index 6d53cef55b..0afa6caaa5 100644
--- a/modules/@angular/compiler/test/output/js_emitter_spec.ts
+++ b/modules/@angular/compiler/test/output/js_emitter_spec.ts
@@ -27,6 +27,7 @@ class SimpleJsImportGenerator implements ImportResolver {
     return importedUrlStr;
   }
   getImportAs(symbol: StaticSymbol): StaticSymbol { return null; }
+  getTypeArity(symbol: StaticSymbol): number /*|null*/ { return null; }
 }
 
 export function main() {
diff --git a/modules/@angular/compiler/test/output/output_emitter_util.ts b/modules/@angular/compiler/test/output/output_emitter_util.ts
index 1a32940b59..bd30ef9380 100644
--- a/modules/@angular/compiler/test/output/output_emitter_util.ts
+++ b/modules/@angular/compiler/test/output/output_emitter_util.ts
@@ -264,4 +264,5 @@ export class SimpleJsImportGenerator implements ImportResolver {
     return importedUrlStr;
   }
   getImportAs(symbol: StaticSymbol): StaticSymbol { return null; }
+  getTypeArity(symbol: StaticSymbol): number /*|null*/ { return null; }
 }
diff --git a/modules/@angular/compiler/test/output/ts_emitter_node_only_spec.ts b/modules/@angular/compiler/test/output/ts_emitter_node_only_spec.ts
index af274a9457..b130871ddb 100644
--- a/modules/@angular/compiler/test/output/ts_emitter_node_only_spec.ts
+++ b/modules/@angular/compiler/test/output/ts_emitter_node_only_spec.ts
@@ -75,4 +75,5 @@ class StubReflectorHost implements StaticSymbolResolverHost {
 class StubImportResolver extends ImportResolver {
   fileNameToModuleName(importedFilePath: string, containingFilePath: string): string { return ''; }
   getImportAs(symbol: StaticSymbol): StaticSymbol { return null; }
+  getTypeArity(symbol: StaticSymbol): number /*|null*/ { return null; }
 }
diff --git a/modules/@angular/compiler/test/output/ts_emitter_spec.ts b/modules/@angular/compiler/test/output/ts_emitter_spec.ts
index 58506f5530..9cd0c5c322 100644
--- a/modules/@angular/compiler/test/output/ts_emitter_spec.ts
+++ b/modules/@angular/compiler/test/output/ts_emitter_spec.ts
@@ -28,6 +28,7 @@ class SimpleJsImportGenerator implements ImportResolver {
     return importedUrlStr;
   }
   getImportAs(symbol: StaticSymbol): StaticSymbol { return null; }
+  getTypeArity(symbol: StaticSymbol): number /*|null*/ { return null; }
 }
 
 export function main() {
@@ -429,11 +430,19 @@ export function main() {
     });
 
     it('should support expression types', () => {
+      expect(
+          emitStmt(o.variable('a').set(o.NULL_EXPR).toDeclStmt(o.expressionType(o.variable('b')))))
+          .toEqual('var a:b = (null as any);');
+    });
+
+    it('should support expressions with type parameters', () => {
       expect(emitStmt(o.variable('a')
                           .set(o.NULL_EXPR)
-                          .toDeclStmt(o.expressionType(
-                              o.variable('b'), [o.expressionType(o.variable('c'))]))))
-          .toEqual('var a:b<c> = (null as any);');
+                          .toDeclStmt(o.importType(externalModuleIdentifier, [o.STRING_TYPE]))))
+          .toEqual([
+            `import * as import0 from 'somePackage/someOtherPath';`,
+            `var a:import0.someExternalId<string> = (null as any);`
+          ].join('\n'));
     });
 
     it('should support combined types', () => {