Thread: exhaust dummy..
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Old Wed, April 21st, 2010, 10:54 PM
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Originally Posted by 907dave View Post
Do a turbo back and be done with it.

The whole back-pressure idea is a gasser thing and does not apply to our diesels. The turbo can generate all the back-pressure you want.
I beg to differ just a bit. I've personally dynoed a truck with a 3.5" downpipe and a 4" downpipe and under load lost about 25-30 ft/lbs below 1750 RPM running the 4"... making no other changes. Of course, the 4" flowed better in upper RPM ranges and power was better there as well as having lower EGTs. So there is some truth to the backpressure stuff.
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