The original equipment exhaust finally crapped out on the 03 Dodge with cummins. After a bit of research I bought a "cat back" system from Gale Banks. the original equipment pipe was 3.5", the new is 4" d. I took it to a local shop to have it installed and when it was all said and done they had cut away about six inches of the exhaust and welded in a 3" d. section to attach the 3.5" to the 4" system. The joint is right under the feet of the front seat passanger. It turns out they only had 3" in stock so they stretched it on one end to slip in side thenew 4" and slipped it inside the 3.5" to weld it.

Drat! Why is it that exhaust system people have so little idea of how a system flows?

So now I have a 3" long 3" diameter restriction in my brand new high flow banks exhaust.

Anybody have an idea what the will do to my flow?

(The new system sounds wonderful).

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.