How much HP is 4" exhaust good for???

[silverram323]

I just put on a edge comp and can hit 1250 with in 5 sec WOT on 5x5 and wondering if 4' will be good or go to a 5''. intake and exhaust is all stock right now.

 

[KLockliear]

4" exhaust with a good muffler is generally worth about 150*.

 

[Extreme1]

I think he's gonna need more. It's turbo housing time or maybe a bigger one.

 

[silverram323]

what type of turbo housing or maybe a bigger one are you talking about??? Are you thinking something like pdr 40???

 

[Hammer]

How much HP is 4" exhaust good for???

If he is asking for HP numbers from exhaust,the correct answer would be about 7hp gained only. I do agree with Keith on the temps gained... ... ... ... ... Andy

 

[Joseph Donnelly]

Andy may be remembering my article in TDR Issue 23, where hp went from 380 to 387 going from 3" with Walker 21468 muffler to 4" with no muffler.

 

[silverram323]

I am asking how much HP will 4inch exhaust handle?

(EX. 400-500hp)

Just wondering if i need 5 inch?

 

[Bob Wagner]

4'' should handle 500-550 with ease

 

[KLockliear]

With drugs, we have made 787hp through a 4" exh.