2 1/2" or 3" pipe
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Senior User
Joined: Oct 2002
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From: Montana
2 1/2" or 3" pipe
I have a 1994 F-250 with a 460 and am redoing the whole exhaust system. I have a set of Hooker Supercomp ceramic coated headers on the way. In my great state of Montana we have no emesions testing so I am not going to run any cats. I plan on doing a true dual exhaust with an H-pipe and Flowmaster Delta flow 50 series mufflers with 3 1/2" tips. My question is weather to run 2 1/2" or 3" pipes? I have heard good and bad things about both. Any recommendations would be nice.
Senior User
Joined: Sep 2002
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From: kansas
2 1/2" or 3" pipe
If you're gonna tow and/or do truck stuff. Go with 2 1/2 it'll keep flow and exhaust scavenging up in a usable rpm.
If you're gonna run a street terror. Go with 3 it'll keep flow and exhaust scavenging up at a high rpm.
If you want both, run 3 from header to muffler, then 2 1/2 from muffler to exit. The front section of pipe is most important to exhaust scavenging. As the exhaust pulses travel down the pipe they tend to slow down and blend together. The muffler increases this. Therefore the smaller pipe after the muffler can help increase flow speed without becoming a restriction. It's also much easier to get over the axle. Your exhaust man will appreciate it anyway.
Most header come with super el-cheapo gaskets. Find something better. I personally like the fel-pro blue. Whatever you get, read the instructions if they have any, and remember to recheck/retourque often while breaking them in.
If you're gonna run a street terror. Go with 3 it'll keep flow and exhaust scavenging up at a high rpm.
If you want both, run 3 from header to muffler, then 2 1/2 from muffler to exit. The front section of pipe is most important to exhaust scavenging. As the exhaust pulses travel down the pipe they tend to slow down and blend together. The muffler increases this. Therefore the smaller pipe after the muffler can help increase flow speed without becoming a restriction. It's also much easier to get over the axle. Your exhaust man will appreciate it anyway.
Most header come with super el-cheapo gaskets. Find something better. I personally like the fel-pro blue. Whatever you get, read the instructions if they have any, and remember to recheck/retourque often while breaking them in.
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Joined: Sep 2002
Posts: 57
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2 1/2" or 3" pipe
i would run 3in because it sounds better and people say that it takes away your torque but i havent really felt it ruch im running a small block with 10.1 compression 498lift cam 750 double pumper edlebrock performer rpm manifold i shift the truck 7000 rpm i love the 3in exhaust its a lot deeper sound and louder than 2 1/2 in, i love it my buddy had a stcok 454 and ran 3in and couldn't tell a diffrence in tourqe come on its a big block it sounded awsome and it was a stock motor.
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