So, How much is too much exhaust flow?
Thread Starter
TECH Fanatic
Joined: Aug 2003
Posts: 1,049
Likes: 0
From: Newport News, Va
So, How much is too much exhaust flow? Ok, Ive been wondering about headers and exhaust.... I want to understand their flow abilities, and how much HP is good for a certain application...
How much power are 2.5" True Duals good up to?3"?
What about headers?
1 3/4?
1 5/8?
1 7/8?
Thanks
How much power are 2.5" True Duals good up to?3"?
What about headers?
1 3/4?
1 5/8?
1 7/8?
Thanks
1 3/4" headers are best for 346-400" motors. 400+" motors can benefit from 1 7/8" headers. Dual 2.5" pipes have the same area as a single 3.5" pipe. They are good to 450 rwhp. Over that, dual 3" pipes are an improvement. Once past the headers, it's almost not possible to have too much flow. LS1s love to breathe. Dual 3" pipes will not hold you back.
__________________
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
2013 Corvette Grand Sport A6 LME forged 416, Greg Good ported TFS 255 LS3 heads, 222/242 .629"/.604" 121LSA Pat G blower cam, ARH 1 7/8" headers, ESC Novi 1500 Supercharger w/8 rib direct drive conversion, 747rwhp/709rwtq on 93 octane, 801rwhp/735rwtq on race fuel, 10.1 @ 147.25mph 1/4 mile, 174.7mph Half Mile.
2016 Corvette Z51 M7 Magnuson Heartbeat 2300 supercharger, TSP LT headers, Pat G tuned, 667rwhp, 662rwtq, 191mph TX Mile.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph TX Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 TX Mile
2022 Cadillac Escalade 6.2L A10 S&B CAI, Corsa catback.
2023 Corvette 3LT Z51 soon to be modified.
Custom LSX tuning in person or via email press here.
TECH Fanatic
Joined: Jun 2002
Posts: 1,979
Likes: 3
From: Upstate NY
Look for the smallest restriction in the exhaust system. Often, but not always, it's the muffler(s). You can't always tell by looking how they flow. Optimum sized primaries and collectors aren't worth much if you stick on mufflers that flow like 2 inch (or even smaller) tubes. It happens often, especially with some big-name mufflers. It's like stuffing a cork in your engine..or a lot like constipation..doesn't run worth a $h!t.
