Ive got a 07 classic dmax just wondering what kind of exhaust to run.4" or 5".it is all stock dont have much left to spend but i do pull heavy trailer .thanks

 

4 inch would be fine, you gain a little less hp with the 5 inch

 

We have 4" Expandit Kits on sale.

 

4" is just fine and the stock intake is the best overall.

 

modified stock

 

Just like these guys said.. 4" exhaust with a modified air intake..

This link will take you to a DIY air intake mod for LBZ's >> https://www.dieselbombers.com/chevy-...irbox-mod.html

 

4'' with cold air intake

 

i got a K&N intake... love it (turbo screams now! ) and i also JUST bought 4" cat-back mbrp its nice but duramaxs are pretty quiet so id suggest goin down pipe back. im actually ordering my down right now. she barks when i get on it but at idle shes a little louder than stock.

 

eh i take that back, i flew by my buddy that was in his jeep. and he said it almost blew his ear drum haha. but still goin down pipe haha

 

I suggest the 4" MBRP, and for a intake S&B. I have ran Banks and S&B on my current truck, 07.5 LMM. And both have showed improvement over stock.

Tyler
MPF