dart4forte

Any 07 5.9 owners here change to a less restrictive muffler, notice any differance in performance/milage?

wreedCTD

alot of people on here run different mufflers or straight pipe, i think it lowers EGTs but i cant see it helping MPG very much.

MTC

I changed mine out for an MBRP muffler. I love the sound and it seems like the throttle response became better. Honestly though, it seems like the mileage went down...prolly cause I'm on it more cause it sounds so good.

lukedaemon

I went with MBRP as well. Dual out. I love the sound. Mpg 14.8 around town and 21ish hwy. I am not one to keep my foot out it either.

levigarrett76

51" donaldson and love it, quiet as stock in cab, kept the lower egts my dynatech straight through gave me, without the noise