ed paul

it"s on,,,,I like it,,it is louder than stock,,but not too loud,don"t know what it is doing for performance cause i did afew things at once,,afe proguard 7 air system,torque tube and a bed shell cap, to top it all off,I'm on winter blend fuel, so ur guess is as good as mine on performance, it does have a nice deep low sound. doesn"t sound like a dump truck.
as for egt,,,don"t have a pyro yet so i couldn"t say

OOPS

How does it sound in the cab at crusing speeds-65-70mph. Do you have any pictures?

Strjock81

I am debating swapping out my 36" DOnaldson for the 51", but was also worried about fitment issues. Mine has a pretty good drone about 21-2300 rpms...not terrible but annoying to me. Might also try undercoating and a layer of soundproofing because I like the sound it has from outside the cab!

Forrest Nearing

do the sound proofing!!!

Forrest

ed paul

at 65mph it sounds stock,,at 70 it"s abit louder than stock,but not to bad,,i know it" there at 70,,gonna have to turn the radio up acouple clicks, sorry,,no pics yet.
the 51 in. will just barely fit,,unless the cat is gone, then there is all kinds of room, the guy who installed it , scratched his head for ten minutes then got another guy over for another opinion,it"s tight,,but he did a good job,,it looks good