Exhaust gas system

1. An exhaust gas system, comprising:

a turbocharger housing; and

an exhaust manifold having manifold pipes and connected to the turbocharger housing,

wherein the turbocharger housing has an area which forms a pipe collector extending in a direction of the exhaust manifold for connection of the manifold pipes and having attachment ports for receiving inner pipes of the manifold pipes;

wherein the inner pipes are connected to the attachment ports of the pipe collector via a sliding fit,

wherein the pipe collector is airgap-insulated, and

wherein the pipe collector is subdivided in longitudinal direction in two feeds which are separated from one another in a gastight manner.

2. The exhaust gas system of claim 1 , wherein the exhaust manifold has outer shells disposed in surrounding relationship to the pipe collector.

3. The exhaust gas system of claim 2 , wherein the outer shells of the exhaust manifold are welded with the turbocharger housing.

4. The exhaust gas system of claim 1 , wherein the turbocharger housing and the pipe collector are made of a common casting.

5. The exhaust gas system of claim 1 , wherein the exhaust manifold is airgap-insulated.

6. An exhaust gas system, comprising:

a turbocharger housing; and

an exhaust manifold having manifold pipes and connected to the turbocharger housing, wherein the turbocharger housing has an area which forms a pipe collector extending in a direction of the exhaust manifold for connection of the manifold pipes and having attachment ports for receiving inner pipes of the manifold pipes, said pipe collector being airgap-insulated, said exhaust manifold having outer shells disposed in surrounding relationship to the pipe collector, wherein the inner pipes are connected to the attachment ports of the pipe collector via a sliding fit; and

a flange formed on the turbocharger housing for attachment to one of the outer shells.

7. The exhaust gas system of claim 6 , wherein the turbocharger housing and the pipe collector are made of a common casting.

8. The exhaust gas system of claim 6 , wherein the exhaust manifold is airgap-insulated.

9. The exhaust gas system of claim 6 , wherein the outer shells of the exhaust manifold are welded with the turbocharger housing.

10. The exhaust gas system of claim 6 , wherein the pipe collector is connected to a cylinder head flange by a welded connection at a distance to the flange.

11. The exhaust gas system of claim 10 , wherein the flange is positioned in a transition zone between the turbocharger housing and the pipe collector and welded to the cylinder head flange.

12. The exhaust gas system of claim 6 , wherein the outer shells are sized to extend beyond turbocharger-side ends of gas-conducting inner pipes of the manifold pipes and welded to the turbocharger housing in a gastight manner such that the sliding fit between the inner pipes and attachment ports of the pipe collector as well as the pipe collector itself are surrounded by the outer shells and are airgap-insulated.