3 IN or 2.5 IN exhaust?????
#1
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Hey everyone, I have a 2002 Ram 1500 with the 360ci engine (5.9L gas), with a PowerAID TBI spacer and an AIRAID CAI. Looking to go from single exit to true dual exhaust. Have flowmaster on it with 3 IN all the way from cats. Anyone have suggestions on whether I should use 3in or 2.5in pipes for the new exhaust?? What would be better power wise?? or fuel economy wise?? Not to worried about the gas mileage though, I only get 12mpg as it is. Thanks. (sorry I accidentally posted this twice, this is the one I wanted to post)
Last edited by mista.nate; 09-23-2010 at 07:44 PM.
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#5
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Negative. Back pressure isn't good. Velocity is good.
Pipes that are too big kill velocity, which in turn kills the scavenging of spent exhaust gasses from the cyls, which reduces the amount of burn, which results in less power.
I'd recommend a single 3" all the way back, an edelbrock air gap intake manifold (I keep hearing reports of major fuel economy and power gains) and a good cold air intake. You've already got one, but does it draw cold air, or just underhood air? The throttle body spacer might as well be a crystal ball, imho they're junk.
Pipes that are too big kill velocity, which in turn kills the scavenging of spent exhaust gasses from the cyls, which reduces the amount of burn, which results in less power.
I'd recommend a single 3" all the way back, an edelbrock air gap intake manifold (I keep hearing reports of major fuel economy and power gains) and a good cold air intake. You've already got one, but does it draw cold air, or just underhood air? The throttle body spacer might as well be a crystal ball, imho they're junk.
#6
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Thanks for your suggestions. I was wondering about that. I still want to go true dual (2 mufflers), so heres another way. How about using 2 1/2in pipes with a crossover, be it an X or an H?? Or would there be power loss?? I'm new to the truck business, I used to have an 03 Mustang GT with H-pipe crossover and noticed power gains, though maybe its not the same with a truck.
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