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Discussion Starter #1
I recently installed a 2 1/2" mac prochamber h-pipe and mac pro dump exhaust. I already had longtubes installed. I have blocked off the smog pipe and all connections are tight. But the exhaust sounds weird. I feel the exhaust pulses under my car and it sounds like it is growling when I get on it...is this NORMAL???
 

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Formerly BLOWN1989SALEEN
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yes it's normal and sounds BAD @SS if you ask me;)
 

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And so it begins:evil:
 

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yep, normal.

you'll want to bypass the smog pump if you have the tube plug'd up. The smog pump straining against a blocked stystem will sound real crappy, and, I 'hear' it'll burn them up...
 

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Formerly BLOWN1989SALEEN
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Oh, my fault man. I didn't mean to scare ya. If you diagnose the sound and it seems like the smog pump and you don't need it, get a smog pump eliminator kit. They're usually like $50. Sorry for the alarm.:D
 

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That pulsing is the chamber acting like a 1 chamber flowmaster. It sounds cool as hell when you first start it up when its cold
 

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Corral Charter Member
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I've been running an off road H-pipe forever now, and never bypassed the smog pump itself. I just plugged the small tube coming off of the H-pipe. Never had a problem and the smog pump has almost 140K on it.

Just an FYI...
 
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