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Feb 12, 2008 | 12:16 AM

ArExSeven88

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From: elkhart indiana

quick question

i have 88 s4 rx7...i want a custom exhaust..what all do u need for my aux ports to open the way they should..what all can i remove from my stock exhaust and still have the ports open? thanks

Feb 12, 2008 | 01:20 AM

azdk

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From: cedar mills,or

from what i have read the aux ports are controled either electronically or by the air pump

Feb 12, 2008 | 02:01 AM

Bama420

Upside-umop Racing

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From: Naples, Fl

correct me if I'm wrong, but I have read on here that for the s4 the ports are controlled by exhaust back pressure and for the s5 they're controlled by the air pump.