Stock length headers
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Shorty headers like the B&B brand do provide a power gain over the stock exhaust manifolds, but it is not a significant gain like with long tube headers. Still, it is not a bad mod if you want a HP bump.
Le Mans Master
Joined: Dec 2005
Posts: 8,475
Likes: 332
From: Port Arthur, Texas 77642
Your factory cats are the biggest bottleneck. If you can get by with removing them go LT's no cats. Texas Speed and Hinson are advertising LT's on here for prices comparable to shorties. Or install a cat-less Y from Breathless Performance to your factory manifolds for an inexpensive increase in power and sound. I did on my 99 Coupe many many years ago and along with drilled factory airbox, K&N filter and Hypertech (that tells you a lonnng time ago) canned tune dynoed 336/341 to the wheels. Added headers and custom tune and it dynoed 344/347 to wheels on same dyno same day. My point is that on a stock internal LS1 the factory exhaust manifolds and no cats performed well and although the LT's and tune gained a few hp/tq the $2,000+ for Kooks LT's/X-Pipe and LS1 Edit tune were not a cost effective purchase. Later with AFR heads and baby Comp Cam I gained over 50 hp/tq to the wheels. Added blower then dynoed 606/506 and I"m certain the LT's were a bigger contributor to the total package.
Le Mans Master
Joined: Dec 2005
Posts: 8,475
Likes: 332
From: Port Arthur, Texas 77642
Link provided below, one picture worth a thousand words...
http://www.breathlessracing.com/inde...&productId=879
3 more pictures...
http://www.breathlessracing.com/prod...?productId=879
Weld in place, turn off your rear O2's for no CEL and your good to go.
http://www.breathlessracing.com/inde...&productId=879
3 more pictures...
http://www.breathlessracing.com/prod...?productId=879
Weld in place, turn off your rear O2's for no CEL and your good to go.
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