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[Paul@1320]

Quote: Originally Posted by Snowie (original)

Has any one any idea on what is the ideal exhaust back pressure.

Mine is currently circa 3.4 PSI Is this too high and interfeering with BHP gains

Set up is GP with JCM 4.2.1 Sports cat and standard GP twin rear silencers complete with the 'flat' bit before the 'y' piece.

We've been eperimting with cat backs and it seems that what you think should work doesn't and what shouldn't work does.

The difference in trq on some is unreal. We were discussing today about having a catback shootout one day next week