matejcekautoworks

ok, on my XJ there is no tubes running to the cat or exhaust system for that matter, i live in mn, do i HAVE to have the cat? or will the jeep run bad, thx guys

BowtieGuy3

I used 2 hi-flow cats on my Olds when I went from single to Dual exhaust on it, and that was cuz of emissions regulations. I never had a problem with the law hitting me for it. I do know its illegal to tamper with emissions systems, unless and adequate replacement is put in place of what is removed. Running a cat actually doesn't cost you that much H.P. I'd say run one, it won't hurt anything.

aircruiser

yeah its illegal in mn. what year is your xj? 97+ has an o2 sensor behind the cat so no cat messes things up. pre-97, only one o2 sensor before the cat so just a big loss in torque if your exhaust is being dumped right after it leaves the engine. no cat to a cherrybomb sounds pretty good..

Metmknice

Check your local laws, if there is no visual inspection you should be fine.

gearheadette

In maryland we have emissions and inspections, however because my jeep is 20 yrs old i can get a Historic tag and bypast those, and do what i will to my jeep. But usally historic tags in the mid-west are like 30yrs. States on the coasts have salt water air so things rust faster, so most of ours is 20yrs.

ktmracer419

it's illegal anywhere in the country.

run a cat

end thread

matejcekautoworks

well my cat is rusted to hell in henn basket lol, so i was thinkin of piping it back to a cherry bomb and still using a stock tail pipe. where i live as long as you aren't super loud the cops dont bother you, plus my uncle is the sherriff , mine is a 91, like i said there is NOTHING running to the cat or behind it for emmissions, honestly i cant see anything that resembles emmitions except the one o2 sensor on the down pipe, so wut im asking is, if i pipe it back to a cherry bomb and still using a stock tail pipe will it hurt anything? thx guys

BowtieGuy3

Hell no, It won't hurt a damn thing. I say go for it then!

Metmknice

Actually, where there are no smog laws.. it does not matter.

BowtieGuy3

I do believe IL is like 20 years. Maybe 25. FYI

gearheadette

ok its 30 and i think in at least one other

89Pioneer

Someone prolly yanked the cat and got paid for it already. Cats are required federally.

ktmracer419

http://www.epa.gov/compliance/resour...donttamper.pdf

matejcekautoworks

wow, looks like a started a braw lol, ok i'll state the reason im asking AGAIN so people that dont read well get it lol "well my cat is rusted to hell in henn basket" the "historic ruin your car tabs" is 25 years here in mn, oh mn stands for MINNASOTA for the guys who dont know, there is no smog limits here, the cops dont care where i live cause most of them run with out one on their own trucks!!! so its nice to know some people (bowtieguy3) understand this idea lol, thx ya'll i just needed to make sure it wont hurt anything

BowtieGuy3

I know back down at one of the race shops I worked at, my buddy had a '99 Ram and had a blocked cat. The dealer wanted a ridiculous amount for a new one, so he hollowed his out the best he could. Then one day it was acting up again, So I told him to cut the thing off and bring it over by my workstation. Well, about an hour later it was back welded on the truck after we split it right above the seam on the topside, gutted that nasty pig, added a thru-pipe and welded it all back together. Pretty sneaky... Solved the cat problem, didn't mess with the computer on it any, and loved the fact he could run our leaded race fuel without worry. Now talk about an emissions violation, hell with the cat, the EPA would crap their britches if they knew we ran leaded fuel. But no one knew, and no one really cared. Unless you have a guilty conscious from hell, remember:

It's only illegeal if you get caught!