Archived 04 05 muffler eliminator

[JKilgore]

has anyone run a straight pipe ? i am thinking of trying this till i can afford a dual mbrp. is the exhaust note unbearable? any info would help :-laf

 

[Hoefler]

I ran one for about 2 weeks. At cruising speeds it is very mellow, but under load even empty, it has a resonating drone that will drive you out of the cab. It was totally unbearable towing a trailer up a 2 mile 6%-8% grade. If you leave the cat alone it may been different, I cleaned my cat out and re-installed it. I ordered a Flowmaster chambered muffler and it tamed it down very nicely. I found, in my opinion, the biggest restriction is in the cat, not the muffler. The pipe from the turbo to the cat has turned a very dark blue. The cat was blue and the blue disappeared half way to the muffler. I believe the waste gate was opening prematurely when it was under heavy load and the air temps were around 102-105. I would loose power under load and hear a hissing noise similar to a air leak. As usual, the dealer said nothing in the computer, so nothing wrong. I questioned the blue cat, they said normal. When gassers turn blue, you replace the cat! The biggest benefit is the reduced EGTs and the improved turbo response. My fuel milage went up from 8-9 to 15. 6-16. 8! Hand calculated.

 

[Nightram]

I have a straight pipe, and it is great! If you don't mind the drone when cruising at freeway (turn up the radio), it sounds like a big rig!

 

[JKilgore]

i ended up putting the straight pipe on and it sounds mean. i have never had so many comments on how tuff my rig sounded as i did w no muffler. live louddd

 

[macdaddy]

Str8 piped here, leave the kitty on and str8 pipe her you'll love it.



Mac

 

[lethal injection]

I put a piece of straight pipe in place of the muffler and am quite impressed by the difference in sound



But I do wonder how much more of a difference there would be if the kitty ran away? Has anyone done both that can give a true difference?