removing catylitic converter/turbo bracket upgrade

[lugnut]

has anyone just removed they're catylitic converter but kept the stock exaust? did you notice any improvements? any problems? i also just got truck back yesterday after they installed the upgraded turbo bracket to get rid of noise at 1500 rpm. it made a huge difference on my 04.

[mschn99]

Originally Posted by lugnut

has anyone just removed they're catylitic converter but kept the stock exaust? did you notice any improvements? any problems? i also just got truck back yesterday after they installed the upgraded turbo bracket to get rid of noise at 1500 rpm. it made a huge difference on my 04.

that brace and new pedistal did help your noise lugnut???

[lugnut]

noise is totally gone and truck is running great. what do you think of removing the cat? the 400 small block is awesome by the way. had two of them, one in a monza, and one in a k 30.

[mschn99]

i think romoving the cat will give you gain even with just the stock exhaust......as long as you dont have to have an anual inspections or anything that they would look for it, but if thats the case just hollow it out.......Marc

[bighunter]

I just finished my exhaust and I gutted the Cat then ran my exhaust pipe through the center and welded up the ends. it looks like it was sold that way except for the 4" exhaust. I love it. It made a big differnce.

[overl0rd]

Gutting or removing the cat will make a definate improvement in turbo/throttle response. Before I made up my 5" and replaced the downpipe I just cut both the muffler and cat out and welded in lenths of pipe.

[Lmbhngr]

Will gutting/removing the CC raise the noise level of the exhaust? I'm kind of partial to the stock noise levels of my 6.0.

[overl0rd]

Yes, it will, but if you still run a muffler it won't be too bad. If you straight pipe it it'l sound like a jet at idle and a big block at speed. Interior noise levels shouldn't change much though.

[pro99line]

My 2002 7.3 did not have a cat so I removed the muffler and went with a piece of stright pipe and I regret it horribly. I have actually ordered a muffler because it is so bad. When idling it sounds awesome. Sounds just like the big block sound. When accelerating you hear a ton of turbo whistle . Bad part is when accelerating it has this horrible sound like it has dropped a valve or something. The sound could also be desibed as a V8 only running on like 6 cylinders. It is horrible. The sound is not so loud. Actually inside the truck I do not even hear a difference. I actually noticed a decrease in fuel economy believe it or not. I was getting 15.5 mpg on the interstate at 80 before removing the muffler. After removing it I only got 15 mpg at 70. Now that part really sucked. I am not sure if not having backpressure will affect the diesel in the same way it will affect a fuel injection gas motor but it sure seems like it did. Oh and the power seems like it has more low end and pulls hard through the rpm range but it doesn't seem to climb rpm's near as fast as it did. Now maybe there is an underlying problem with my truck that is causing it to be this way but it ran perfect before taking off the muffler. Just keep your stock muffler incase you want to put it back.

[sharky]

My 04 has the cat and muffler removed. I was like that when I bought it. It makes this odd jet like sound out of the exhaust all the time, not sure if that is a good or bad thing. I just know a friend of my has an 05 that can't touch mine. all bone stock other than the exhaust.