MAX POWER WITH 4"

[WBacon]

Anyone know at what point a good 4" exhaust becomes an issue as far as trying to make power. Guess I am wondering at what point you need a 5" system. Please chime in with what you have and what you like.

 

[johncameron]

I seem to remember reading that a properly set up 4 inch exhaust is good for over 700HP. So basiclly you don't need anything bigger, you just want it!!



JC

 

[SRadke]

I've seen dyno runs over 600 hp on 4" pipe.



-Scott

 

[KLockliear]

787rwhp is the most we ever made with 4", but I don't think it was the limiting factor.

 

[WCounts]

I have herd the 5" may lower EGTs but is a lot louder. I will have to keep my 4". I don't plan on making more than 550hp and don't want to bother the naborhood.

 

[WBacon]

What seems to be the popular 4" system around here?

 

[SRadke]

What seems to be the popular 4" system around here?

Best product for the money right here.

 

[JKaltenheuser]

Can you even fit 5in between the t-case and the frame? My 4 in downpipe is tight. . as for 5in noise, its a much deeper tone, not necessarily louder. From what i've heard 5in is more tolerable because it doesn't cackle as much.

 

[Reb.B]

807 HP with 4" here. I realy think that if 5" where needed, it would need 5" out of the turbo and a couple feet past it. The hottest point is were you have the most expansion of gases.

 

[Tomeygun]

What seems to be the popular 4" system around here?

the brand that ends with two 6 inch stacks coming out of the bed



I'll never go back!

https://www.turbodieselregister.com/forums/showthread.php?t=139913

 

[WBacon]

Now you guys are really screwing with me!! I had the same thoughts about the 5" being low but not louder. Can anyone else confirm this?

 

[SRadke]

Now you guys are really screwing with me!! I had the same thoughts about the 5" being low but not louder. Can anyone else confirm this?

It's definitly louder!