Engine/Transmission (1998.5 - 2002) stacks, flow, and power

[RJPotts]

A friend and myself were talking about the stacks I'm planning on putting on my truck, I have a 4" straight pipe (Jardine) right now and I am planning on a pair of 5" stacks (not sure which kind yet). He said that I would lose all bottom end power (like a gasser would under the same conditions), I argued that the turbo creates any backpressure needed and that the exhaust will only flow as well as the smallest bend allows (4" downpipe) and the change to 5" would only change the sound.

He also said something about pulse width, and so on and so forth.

Who is right?

-R. J.

 

[Slingblade]

You are correct. He is thinking of a gasoline engine. I neither gained or lost any noticable power going from a straight pipe to stacks (w/o muffler). I did it for sound and looks. I did get a quicker spool up when I straight piped it.

 

[Forrest Nearing]

you are right, your friend is wrong



doesn't that feel good?

 

[bmoeller]

It will improve spool-up quite a bit, axing the OEM exhaust.

 

[RJPotts]

I knew I was right, ha...

I noticed a difference in spoolup with the straight pipe over stock. For those of you with stacks can you hear the exhaust better inside the cab.

The main reasons I'm doing this are for looks, but mainly for the sound, I know what it will sound like already on the outside, but I've never ridden in or driven anything smaller than a Peterbuilt with stacks, so my question is...

-With stacks (no muffler) will I be able to hear the exhaust better inside the cab with the windows down or the back window open. And I mean the actual sound of the exhaust, not the resonance of the pipes (drone)?

Thanks,

R. J.

 

[Forrest Nearing]

oh you'll hear it alright!!! :-laf



Forrest