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I chatted with Mike Haddad last week. Turns out even some of the aftermarket exhaust systems are very restrictive under full boost. Mike had quite a bit of back pressure. He made a major exhaust change which made a serious change in hp.
I did not have permission from Mike to post numbers. But a call or email to him may be in order if you want soe data. He may be thinking about marketing his exhaust tht he developed.
mike
dms
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