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The what: power/torque increase & slightly better sound, all while keeping the stock catalytic converters and their location.
The why: scavenging effect making it easier on the engine on the exhaust stroke, freeing up some power...
Longtubes free up more power & have better sound (in my opinion) but messes with the catalytic converters and begs for a tune.
Disclaimer: I don't have shorties, I'm just regurgitating what I have read about them on this forum. If anyone disagrees with what I have said, I yield.
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2010 1SS/RS - CGM/Gray Interior - M6 (SOLD) Kooks 1 7/8" headers, Solo Mach-X, Vararam.
2012 2LS - Black A6 (SOLD)
2016 1SS Summit White A8
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