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Old 09-08-2011, 03:40 PM   #3
The Stig
knows 2 facts about ducks
 
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Drives: ...and they're both wrong
Join Date: Aug 2009
Location: The HMS Invincible
Posts: 25,072
No catback or axle axle exhaust requires a tune. Headers, probably need a tune but if you're really worried about warranty, get the GMPP exhaust. That won't void your exhaust warranty.
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