exhaust advice
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exhaust advice
ever since i got my 94 855 turbo ive had a rough idle issue, cant boost past 9psi, and im starting to believe this 17 year old car has a clogged cat. I just got my ard white tune and really want to feel 14 psi i believe that my evap purge valve is bad since i have the evap code. i believe the bad valve in conjunction with clogged cat may be my misfire problem??. so my question is would it help my performance (and possibly help fix misfire prob) by just welding a 3" straight pipe? i live in iowa so there is no emissions tests or anything like that. i have my own welder and know how to weld. would a magnaflow work well? ive heard of some guys on here using them. i would like to get the 3 inch downpipe but im pretty sure i have the conical flange so i just wanna wait. my exhaust sounds kinda restrictive and when i punch it... also on another thread of mine i couldnt get past 110... i know i know misfire problem doing a top speed dumb of me but i couldnt help it. Cant boost past 9si even with mbc turned all the way up cant get past 110, rear 02 sensor code, exhaust sounds restrictive specially after cold start. so tell me what you guys think about all this and what i should please and thanks!!!!
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What I found:
"Remove the oxygen sensor and take your reading at its hole in the manifold or headpipe. Refer to the backpressure specs for the application. Generally speaking, more than 1.25 psi of backpressure at idle, or more than 3 psi at 2,000 rpm tells you there's an exhaust restriction".
"Remove the oxygen sensor and take your reading at its hole in the manifold or headpipe. Refer to the backpressure specs for the application. Generally speaking, more than 1.25 psi of backpressure at idle, or more than 3 psi at 2,000 rpm tells you there's an exhaust restriction".
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