First of all, I'm hoping this is the right place for this question. I'm planning on putting a dual exhaust on my truck within the next month. I'm going to do this myself with some help from a few buddies. I was just wondering when I put the pipe peices together (bends, fittings...) if I can get away with just clamping them and some sealant or if I have to weld them? Also, how well does flextube work? Iv heard that it gives a tinny sound to the exhaust. Thanks for any help.

P.s. I plan to get pictures posted after the exhaust is on :D

 

i've never welder exhaust, i don't think it's necissary, just make sure all your fittings are the right size for eachother, and the clamps are the right size... this allows you to be able to change it without replacing the entire system, or having to hack the entire thing up...

i wouldn't use the flex tubing, i don't trust it

 

Alright, I was hoping so. That was another question I had, what diameter pipe is best? I think stock on a 02 4.0L is 2.25 maybe? Obviously the outlets could be different as long as they match. And yea, the flextube sounds kind of sketchy.

 

2.5" is good for the 4.0

 

I have a single in dual out stainless system on my 4.0L. Go with 2.5" in and 2.25" when it splits

 

Ok, that's what I plan on doing too, bit I am just going to use the stock pipe from the cat going into the muffler, so is that stock 2.5"?