Want to Kill Drone
#12
they all start out "free flowing", but due to their design, they don't stay that way. they're basically a bunch of interwoven screens designed to trap soot. when the engine is running, it produces soot. the more particulate it traps, the less room there is available to pass the exhaust. you don't need to dissassemble one to understand it's function-simply look through it. the inlet / exit is 4", but it only shows 1" of light. in short, if you want it to breathe, don't add restrictions. (kinda like the "cat-back" exhaust-it's effect on flow is negligible, but someone said it would blah blah blah) don't take my word for it though- do the math regarding flow characteristics, and decide from there. also- the location of the muffler has a lot to do with the resonance, as do the hanger brackets. the factory uses the most convenient locations for attachment, not the optimal ones. lose the mount at the bell housing, relocate it to the frame, and voila........you can turn the stereo down a bit. this info is the result of "trial and error". mine is loud as hell to those beside me, but the in-cab noise more than acceptable.
#13
I must be getting old...I deleted the muffler and kept the kitty (about 5 years ago) on my '04.5 Dodge CTD. I love the sound, but the drone and interior noise is getting on my nerves anymore. What mufflers will kill the drone and interior noise but keep the Cummins sound / tone? I really don't see the need to do an entire exhaust system being that it is already 4". Just want to cut my straight pipe out and put a performance muffler in.
#16
#17
#19