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PostPosted: Fri Apr 07, 2017 2:14 pm
by bluptgm3
In 1995 Dr Gas offered an X-pipe to replace the 1995 pre-catalyst merge. The 1996+ true twin-pipe catalyst section had better flow and Dr Gas dropped his production of an E36 X-pipe.

I think there is the possibility of some benefit to adding a X-pipe in the OBDII system, don't know what it would do to the post-catalyst sensors or how they might behave.
I have found on V8's with headers with a cross-over (H-pipe) that the engine makes slightly more torque.