How much HP/torke will I loose by going with a bigger pipe? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dion · 07-26-2002, 10:28 PM

I have dual Flowmaster 40's with 2 1/4 pipes, I wan to go to 2 1/2 or 3 inch pipes. Will I notice much loss?

*Zkast* · 07-26-2002, 10:37 PM

Really depends on the torque/hp your engine was built for. Typically if you have a stock engine or slightly modified, you can go with 2 1/2 and gain a bit of top end without loosing much low end torque. 3 inch exhaust on a stock setup will kill your low end torque.

I love the sound of 2 1/2's and 40's. I've run that for several years and still never get tired of hearing that tone

dion · 07-26-2002, 10:40 PM

Does anybody have 2 1/2 from the headers and 3 from the mufflers?

*Zkast* · 07-26-2002, 10:47 PM

Never done that hehe. I would think it would give a "airy" sound though. Might not like that too much.

crazy longhorn · 07-26-2002, 10:50 PM

Yes, i have Hooker headers 2 1/2 in & put of the muffs, with H pipe, & stepped up to 3" on the tail pipes turned out the sides ahead of the tires. this was waaay to loud with the 40s flows,& they were replaced with Dynomax superturbos,& also have resonated stainless tips(much better),has a nice sound, but still has a resonance at hyway cruise that will drive you nuts after a few miles! I think I may go with 2 1/2" tail pipes to tame it down a bit more.......Al

barn9 · 07-26-2002, 10:51 PM

You should get some sweet sound from the the 2.25's, so why change? 2.5's if you really think you need them, 3's a waste of $$ IMO.

07-26-2002, 10:28 PM	#1
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	How much HP/torke will I loose by going with a bigger pipe? I have dual Flowmaster 40's with 2 1/4 pipes, I wan to go to 2 1/2 or 3 inch pipes. Will I notice much loss? __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

07-26-2002, 10:40 PM	#3
dion 72 Cheyenne Join Date: Oct 2001 Location: San Diego Posts: 2,086	Does anybody have 2 1/2 from the headers and 3 from the mufflers? __________________ Burnout Idle 1972Cheyenne 1966/67Stouts

07-26-2002, 10:51 PM	#6
barn9 Half a bubble off! Join Date: Jun 2000 Location: Winfield, Ks, USA Posts: 5,588	You should get some sweet sound from the the 2.25's, so why change? 2.5's if you really think you need them, 3's a waste of $$ IMO. __________________ Just call me LB. '71 Cheyenne, 402BB, hauls blondes, brunettes, or redheads.

07-26-2002, 10:37 PM	#2
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	Really depends on the torque/hp your engine was built for. Typically if you have a stock engine or slightly modified, you can go with 2 1/2 and gain a bit of top end without loosing much low end torque. 3 inch exhaust on a stock setup will kill your low end torque. I love the sound of 2 1/2's and 40's. I've run that for several years and still never get tired of hearing that tone

07-26-2002, 10:47 PM	#4
Zkast Account Suspended Join Date: May 2002 Location: Olathe, Kansas Posts: 929	Never done that hehe. I would think it would give a "airy" sound though. Might not like that too much.

07-26-2002, 10:50 PM	#5
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	Yes, i have Hooker headers 2 1/2 in & put of the muffs, with H pipe, & stepped up to 3" on the tail pipes turned out the sides ahead of the tires. this was waaay to loud with the 40s flows,& they were replaced with Dynomax superturbos,& also have resonated stainless tips(much better),has a nice sound, but still has a resonance at hyway cruise that will drive you nuts after a few miles! I think I may go with 2 1/2" tail pipes to tame it down a bit more.......Al



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