exhaust and cold air intake

classic duramax · #1 04-06-2009, 10:39 PM

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

2500HeavyDuty · #2 04-06-2009, 11:38 PM

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

lukesdiesel · #3 04-07-2009, 05:16 AM

We have 4" Expandit Kits on sale.

Rttoys · #4 04-07-2009, 10:44 AM

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

2500HeavyDuty · #5 04-07-2009, 11:11 AM

modified stock

**Oilfield_Mafia** · #6 04-07-2009, 11:23 AM

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 >> http://www.dieselbombers.com/chevy-g...irbox-mod.html

dieselmadscientist · #7 04-07-2009, 11:56 AM

4'' with cold air intake

HeavyChevyDMAX · #8 04-16-2009, 05:12 PM

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.

HeavyChevyDMAX · #9 04-19-2009, 07:09 PM

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

Tyler@MPF · #10 04-20-2009, 07:14 AM

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

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