[smoore1]

i have a 03 2500 hd 4x4 it's stock was thinking of ungrading the exhaust now and getting a chip later. But don't know if i should go with a 4" turbo back or a 5"turbo back also should i run a muffler. My truck don't have cat on it. I do pull a trailer every weekend for about 150 miles. I seen a kit at rpm outlet that has exhaust,programer and intake thats in my bugget anybody deal with this company.

 

[smoore1]

Sorry i realized i put this in the wrong place . Is there anyway to move it?

 

[Horsepower Upgrades]

If you tow heavy you should consider keeping the muffler from the aftermarket system on. Dmaxs tend to get a bit noisy in the cab when you remove the muffler, for some when you remove the cat. You may not have noticed since you are still running a stock muffler, but if you remove both and tow heavy, I think you will be disappointed in the noise levels inside the cab.

 

[smoore1]

My truck is not loud at all but it didn't have a cat on it when i brought it new.

 

[DangerousDuramax]

i have a 03 2500 hd 4x4 it's stock was thinking of ungrading the exhaust now and getting a chip later. But don't know if i should go with a 4" turbo back or a 5"turbo back also should i run a muffler. My truck don't have cat on it. I do pull a trailer every weekend for about 150 miles. I seen a kit at rpm outlet that has exhaust,programer and intake thats in my bugget anybody deal with this company.

Yes, I have the 4" MotoBlue galvanized straight pipe kit. It's decent quality and wasnt too bad to install.

 

[goofy goober]

From what I have read the difference between the 4" & 5" has to do with how much horsepower you are trying to gain. I think the 4" is used the most. Good luck.

 

[Red4x4Duramax]

Yes, I also have the 4" kit from RPM on mine & like the way it installed & sounds. I installed the muffler but plan to take it off sometime to see what it sounds like.