stock exhaust pipe size

thanks bill, thats a good idea....and simple

In Alberta we have pretty lean smog rules, we can run pretty much any setup hassle free...I have a 2.25" header I'm installing, I was just curious what the stock stuff was..2"?

When I put on a 2" header, I replaced the entire exhaust system with 2" stuff. I have been told that I lost a small amount of low end torque because I removed all of the back pressure. I am not sure I can explain why torque and backpressure are related, but assuming this is true, the only stock parts in the system should be the tail pipe itself.

Since you are adding a 2.25" header, then I would suggest a 2.25 CAT and muffler, and go with a 2" tail pipe to choke the system down a little. Scrap all of the stock crap that you have and put in all new low restriction stuff made of 304 Stainless Steel, and close the system down with a smaller tail pipe.

That's what I'm planning to do, 2.25 all the way back. Minus the cat. thats GONE in a big way. Just wondering if stock was 2.25", I guess not. I think it's 2" but I'll measure

I think it was 1 7/8 actually.

I have my 86 CJ7 running a 2" straight pipe back to a Dynomax muffler with good results.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Pi-eyed Piper wrote:

I think the stock size is 1 7/8ths or something like that. In any case it's under 2.

It doesn't matter if you are simply going to match the header all of the way back. I would get a good low restriction muffler to make your Jeep quiet. The exhaust note should be a low rumble that is sweet and pleasant under power, but silent with a slight gurgle while idling.

Frankly, I do not understand your opposition to a cat, other than the cost and you might not be required to have one so spending the money is a waste.

Bill says some really stupid stuff from time to time , but I am with him 100% on this point.

Just go visit the local Mom&Pop Muffler store in your town. They will fabricate you something that is hands down better than anything you can get on the 'net. And, if there is a diner near by, you can get breakfast while you wait.

http://sh> >

Getting rid of the cat means one less thing to go wrong...one less power robbing emission's crapola