optimum exhaust size

[AKfun4wheelin]

What is the optimum size for the pipe from the cat back for a 4.0?

 

[Alec]

For an OHV, I'd say single 2.25" or 2.5". There's not much difference between the 2, but 2.5 will give you more hp, less tq; and 2.25 will give you a bit more tq, less hp. The differences are fairly negligable though. Even with my s/c, I'm still running a 2.25" tailpipe.

 

[haktmal]

I wish they make 2.375" exhaust pipe

(2.25 + 2.50)
____________ = 2.375
2

 

[Skeets'91EB]

My stock tailpipe measures about 2.25," so I think I'm gonna go with 2.5" with a Gibson muffler.