well i hate to do it or say it but i think its time for a muffler. i dont care about outside my main concern is inside the cab. my 3 year old daughter sits in the back seat and my second child is due in 2 months so i need it quiter in the cab but i still want it to bark outside the truck..who is running what? how are the aero turbine mufflers?

 

I had to run a muffler to pass smog. I got a racing muffler from Twister. It cost $115. It cut my exhaust noise in half (needless to say it is not on now) but according to there site you lose little to no HP. http://www.flopro.com/Twister.htm

 

The twisters are nice. What exhaust do you have?

 

I hear ya. Well kinda of I got tired of the noise too and went with the aeroturbine 4040XL. It did reduce the noise in the cab a bit, don't have the drone like I use to and seemed to have lowered my egt's a bit also. Still has great sound outside of the cab. Not sure if it will be enough for what you are looking for as far as in cab noise.

 

I noticed a lot of cab drone disappeared when I compounded my turbos. Not a cost efficient fix, but it does kill a few birds with one stone.
If you have the room, you could put a semi style muffler under the cab/box.

 

Yeah the mbrp 4 inch muffler helps cut back on in cab noise and they still sound aggressive out the pipe

 

4040XL Aeroturbine is what I have. Would do it again in a heartbeat. I did it for the same reasons you are doing it.

 

Yep loves the way my mbrp sounded

 

nice thanks for the replys all...........

 

MBRP sounds great but it does still drone a bit, i installed sound proofing in my cab and installed stacks and wow what a difference, now the only noise i have is from the motor and of course the stacks but its not loud at all.