1998xjspt

sawed my muffler off so as of right now its just strait cat. my question. what are some issues that come with the change of backpressure notw that theres no muffler? and does not having a muffler effect anything besides obvious noise?? im planning to weld strait pipe to tailpipe so fumes wont get in cab when idling..any helps apper-see-ated

98cherokee531

Less back pressure will amount to less torque. Usually vehicles run like crap with no muffler but with the cat it may hold some back pressure still. Your not going to hurt a straight 6 either way

Slim357

Just run it better mpgs more noise and less back pressure. You wont really notice the loss in torque tho

kirknd4spd

Didn't make any difference on mine other than the noise. Ran it straight piped for about 6 months after ripping the muffler off on some rocks for the third time, finally got tired of the noise and welded the muffler back on.

Slim357

I love em loud lol

1998xjspt

alright cool. planning on just putting strait pipe after cat. maybe later if noise gets too anoying ill clamp on muffler or something. has anyone hollowed out there cat and put strait pipe after?

00exjay

I have it sounds good but check engine light take some patience and spark plug non foulers to get around.

Slim357

Just bust a hole in it and put a piece of pipe in it but yes I have done that on a 91 camanchee sounded butter straight piped with no cat imo.

holycaveman

On an injected model you will not notice any power loss. Computer does the job for you.

1998xjspt

nice

1998xjspt

so what will happen if i go play and get water all up in the cat? anything bad happen?

austinjoe13

Don't turn it off unless you're avoiding hydrolocking and you won't have that problem.

1998xjspt

true, just wondering cause once i got stuck in water and when i finally got out (still had motor running, i would rev it up and water would spurt out a bit from cat and muffler. so any water in the cat as long as teh motors running wont damage or effect anything?

austinjoe13

Considering how hot cats are the water would boil off IF it made it that far.

holycaveman

No you will be fine. Cats do eventually go bad. And maybe water would speed up the process slightly. But nothing that would keep me out of water!! LOL