Can an exhaust leak cause performance problems -

4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Old 10-26-2015, 03:28 PM
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Old 04-05-2007, 10:17 PM   #1
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Default Can an exhaust leak cause performance problems

My car is off the road now, blown up t45 transmission, but While I was underneath I noticed a 1/4" gap between where the bottom of the manifold pipe goes into the X-Pipe on one side. My car seemed to be losing power progressively before the transmission failed. I've always noticed a leak but couldnt pinpoint it until now. It makes no noise at idle, the only time I hear the leak is under load, a fairly loud tick...tick...tick, and it gets louder the higher the RPM (only while under load), until At WOT it sounds like a lot of the exhaust is coming out there.

Can a leak like this cause performance problems? I don't have any o2 codes or anything.
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Old 04-05-2007, 10:58 PM   #2
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Default RE: Can an exhaust leak cause performance problems

Im not a mechanic but im pretty sure you will lose out on your stang's performance. I had a mechanic install my racing clutch and when he put my h-pipe back on hey screwed up my flanges and causeda major exhaust leak that was located between my headers and h-pipe, and when he started my car it sounded like an old beat up 52 chevy. Sounded horrible it puttered and idled all weird.
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