4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

my exhaust leak

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Old May 9, 2008 | 11:19 PM
  #1  
00blackstang's Avatar
00blackstang
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Joined: Feb 2007
Posts: 680
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Default my exhaust leak

ok guys i need ur help... i have an exhaust leak on the passenger side where the midpipe bolts up to the header. i think its bc i let the sylicone dry by accident on the gasket before i bolted it up. Sometimes its loud, sometimes i dont even hear it at all ( the leak ). I need ur help to get me motivated to get off my lazy *** and into the garage to fix it. I know what i gotta do to fix it just lazy.

- does a exhaust leak rele hurt ur performance?

- do u think i can get away with not unbolting the catback and just pulling header/midpipe bolts out?
Old May 10, 2008 | 10:02 AM
  #2  
NeedStangSpeed's Avatar
NeedStangSpeed
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Joined: Oct 2006
Posts: 786
From: New Philadelphia, Ohio
Default RE: my exhaust leak

ORIGINAL: 00blackstang

ok guys i need ur help... i have an exhaust leak on the passenger side where the midpipe bolts up to the header. i think its bc i let the sylicone dry by accident on the gasket before i bolted it up. Sometimes its loud, sometimes i dont even hear it at all ( the leak ). I need ur help to get me motivated to get off my lazy *** and into the garage to fix it. I know what i gotta do to fix it just lazy.

- does a exhaust leak rele hurt ur performance? YES! when you have a leak before the O2 sensors, unless you have them eliminated, it will screw up the reading for them and the computer will try to compensate for that, causing worse performance. IE... running to rich or lean, by trying to compensate by adding fuel or taking away fuel.

- do u think i can get away with not unbolting the catback and just pulling header/midpipe bolts out?maybe, but I'd highly suggest getting a new gasket, and not putting any silicone on it at all, it will seal just fine by tightening the bolts for it. Silicone is not needed for any part of the exhaust.
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