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Re: ISO info Re E12 replacement exhaust (archive)
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Posted by Karl on February 12, 2002 at 21:47:45:

In Reply to: ISO info Re E12 replacement exhaust posted by Ken in NC on February 04, 2002 at 09:09:59:

My experience with shops is they eon't want to modify the cat or anything upstream from it, and that's where the power is.

As Dean pointed out, firstfives.org had a thread on the subject for a while. I think it's been organized onto a FAQ. The major improvement is to replace that six-into-one exhaust manifold with a split manifold running three exhausts into each of two primary pipes. In my case, I got the manifolds and dual cats from a totalled e34 car, but I also got the 3.5L engine. ;-)

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