4 inch or 5 inch

[tippmann222]

I do not have much done to my truck yet and am trying to decide between a 4in or 5in exhaust system? Any help????O ya its a 7.3.....Thanks

[lifewitlooie]

4in is fine. works great.

[robertcarmel]

From everything I have read, 4" is the way to go, unless you are well into the 500+ RWHP range! Any less than that, and it MAY be less effective. I went with the 4" recently my self for just that reason!

[tippmann222]

Ok thanks guys.....Would you suggest straight piped or what?

[SMKSTAX]

Yes definitely straight piped!!

[hawktuner]

I got a 5" mbrp turbo back on my truck. I love the sound and the looks. I have some buddys with 4"ers and they are pretty good also. So either one will work great.

[Raul@Stealth Automotive]

def go 4" straight pipe

[Big AL]

I agree with the 4"

[robertcarmel]

I hear the straight pipe is the way to go with the 7.3, but the 6.0 is a personal choice. I know that the muff I have you could drop an apple through it without hitting, and mine is the family vehicle, so I kept the Muff, and it does have a throaty sound, but it is still quiet.

[bigred69]

It's all about sound and price preference really. A 5" will be just as effective as a 4", but will probably cost more. The turbo causes enough back pressure for the engine, so exhaust size doesn't effect it that much.