Geoff Baltz

My rattle is still around. I have put a new 3" Cat bypass on the car, replaced the O2 sensor and checked all the heatshields. Nothing has helped. (Except for the bypass in the horsepower department. hehe)
There is one pipe that was not replaced. It is the one that comes right off the turbo and then attaches to the downpipe. It is only about 10 inches long. A tech at one of the local Porsche dealers told me that this pipe is a double-wall pipe like the downpipe and he thinks it is coming from there. Problem is that I can find the part in the parts diagrams of the exhaust but can't find a part number.

Questions-

Has anyone experienced this problem?
Has anyone experienced the replacement?
Does anyone have the part number that I am looking for?

Thanks.

-g

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Geoff Baltz
'86 944 Turbo http://www.ninefiveone.com

Julian Allen

The downpipe from the turbo (bolts to the block and to the turbo) is different for up to 89 (951 111 097 02) and for the 90 and up (951 111 098 01). I do not know what the difference is.

This pipe, like all of the turbo exhaust, is either double wall or covered with heat shields. I doubt however, that this pipe is causing your rattle. I would look at surrounding heat shields as the most likely cause. Specifically look at the shields attached to the crossmember (that holds the steering rack and supports the engine), and the shields above the catalytic converter.

Hope this helps you.