Okay, so I want to throw on a straight pipe. I've found some 4" and a 5". Which one should I get? I rode in a truck last week with a 5" straight pipe and it sounded pretty good. Let me know what you think. Thanks a lot, George

 

Do a search and you'll find hours upon hours of reading. Some folk say you need a 5 in exhaust system only if your around 450-500 hp and higher. Anything below that and your actually losing hp and performance. I guess it just depends on how high your gonna go performance wise. I'd go w/ the 4 in because its a little cheaper and trust me, you won't be disappointed with it.

 

Would 4" coming out in front of the rear wheel be annoying?

 

It sure is loud like that.A friend of mine has that set up.Its not annoying,I mean its a straight piped cummins!It always sounds good.But really,I think going all the way to the back sounds better.Its a little smoother sound.

 

A 4" straight pipe with a turn down dumping before the rear axle would be annoying to me! A side pipe would be a little better as it won't echo off the road so bad.......If you really want some noise, put on a set of straight piped stacks! ........Either way, a 4" straight pipe exiting out the back will resonate with authority in the cab and outside!

DD4x4 is correct...........a 4" system will provide adequate flow for 450-500hp.........you will not benefit from a 5" system unless you expect to exceed 500hp......

 

In my quest to buy parts, at the available rate of incoming money, I took my truck to a local muffler shop. They cut out the resonator and muffler. Added a piece, after making an offset in it, welded it in, and the total cost was $56. Sounds good, and breathes a little easier. Fun to drive too!

Now I'm off for gages, intake and some tranny work. Then I'll return and finish the exhaust with a 4".

 

I'd go 5" because then you won't have to upgrade when you do twins.

You ARE going twins, aren't you?

hehe-- seems like I'm the only on who doesn't have them

jlh

 

No twins for me.