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Old 08-20-2013, 04:13 PM   #15
black79ta
 
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I have 1 7/8 kooks, 3×3 cats. Cut off the 2.5 " end of flowmaster AT welded on 3 inch end. 3 inches all the way back. Love it.
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Old 08-20-2013, 07:58 PM   #16
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I have 1 7/8 kooks, 3×3 cats. Cut off the 2.5 " end of flowmaster AT welded on 3 inch end. 3 inches all the way back. Love it.
That's what I'm gonna do one of these days. I bought the neck-down version of the JBA 3" long before I got the headers. Simple problem with a simple remedy!
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Old 08-20-2013, 09:04 PM   #17
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I slapped a Flowmaster 3" catback and center mount exhaust with the kooks and I live it!
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Old 10-29-2013, 09:47 PM   #18
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Needed to update this. Now making 741 RWHP and still using 1-7/8 kooks headers, kooks off road pipes and stock 2.5 pipes. Thinking it would help some to move to a full 3 inch exhaust?
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Old 10-29-2013, 09:55 PM   #19
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Needed to update this. Now making 741 RWHP and still using 1-7/8 kooks headers, kooks off road pipes and stock 2.5 pipes. Thinking it would help some to move to a full 3 inch exhaust?
Nothing drastic. $/hp you will be disappointed.
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Old 10-30-2013, 02:23 AM   #20
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ARH makes a full 3" kit
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Old 10-30-2013, 03:05 AM   #21
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Originally Posted by Criag B View Post
Needed to update this. Now making 741 RWHP and still using 1-7/8 kooks headers, kooks off road pipes and stock 2.5 pipes. Thinking it would help some to move to a full 3 inch exhaust?
At 700+whp, a full 3in exhaust would have already been on my car.
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Old 10-30-2013, 08:17 AM   #22
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Waste of money for true dual 3" on these cars.
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Old 10-30-2013, 09:52 AM   #23
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Waste of money for true dual 3" on these cars.
Says the guy without a 3" exhaust.
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Old 10-30-2013, 04:09 PM   #24
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Waste of money for true dual 3" on these cars.
Funny u say that because a guy that dyno's 100's of Camaro's told me he never sees any gains from cars that switched to 3inch exhaust. He has told me when your over 800 +rwhp then it's worth it. Has anyone done any back to back testing switching the 2.5 to 3 on the dyno??
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Old 10-30-2013, 04:36 PM   #25
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Funny u say that because a guy that dyno's 100's of Camaro's told me he never sees any gains from cars that switched to 3inch exhaust. He has told me when your over 800 +rwhp then it's worth it. Has anyone done any back to back testing switching the 2.5 to 3 on the dyno??
Everything I have ever seen says you won't gain much of anything going to a 3". I choose to look at it differently. You don't really lose anything by going with a 3" exhaust either. I think the 3" catbacks sound a LOT better than any of the 2.5" I have heard.
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Old 10-30-2013, 09:12 PM   #26
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Quote:
Originally Posted by Criag B View Post
Funny u say that because a guy that dyno's 100's of Camaro's told me he never sees any gains from cars that switched to 3inch exhaust. He has told me when your over 800 +rwhp then it's worth it. Has anyone done any back to back testing switching the 2.5 to 3 on the dyno??
While the 2.5in pipes can handle 700+whp, at that power level, a 3in exhaust will surely help. Think of it another way, Your engine is making around 900 crank hp. Tell me that doesn't deserve a 3in exhaust.
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Old 10-30-2013, 09:23 PM   #27
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While the 2.5in pipes can handle 700+whp, at that power level, a 3in exhaust will surely help. Think of it another way, Your engine is making around 900 crank hp. Tell me that doesn't deserve a 3in exhaust.
I would agree, hell back in the day a SBC with anything over 500 hp always got 3 inch pipe on it.
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Old 10-30-2013, 09:31 PM   #28
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I would agree, hell back in the day a SBC with anything over 500 hp always got 3 inch pipe on it.
I agree but I wouldn't hesitate to leave the stock 2.5in piping on a 500+whp car. Once you're boosted and pushing well over 600whp, you NEED a bigger exhaust.
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