Anyone else running with no cat. coverter?

xSILENTx · 10-11-2003, 06:32 PM

I need to get a new cat for inspection but util then i'm just gonna put a striaght pipe in and take out the cat. HAs anyone else done this?Is it a bad idea?

**2True** · 10-11-2003, 08:29 PM

I have no cat on the Talon. It is louder (that's a given) but it also makes your car put out a lot of black exhaust smoke.

Other than that it is no big deal.

**ChikagoGTZ** · 10-11-2003, 08:36 PM

Ya, cats are usually good ideas and they prob only rob a few ponies.

xSILENTx · 10-13-2003, 10:44 AM

if i buy i high flow cat can i just bolt it right on?

**95vegasgalant** · 10-15-2003, 11:55 PM

:twisted: probably the eclipse will fit I got a hollowed cat and I regret doing it I use more gas and it stinks

**JiP** · 10-19-2003, 02:28 PM

eclipse wont fit the flange on it is like angled ours are both straight. An exhuast shop could defntly do it. I have only the front "downpipe" cat, my second cat has been removed for years I pass insepction everytime.

xSILENTx · 01-18-2004, 08:58 PM

I posted this awhile ago but finally got took my cat out after inspection.I was just wondering how illegal this reall is and what kinda of price i'm looking to pay if i get cuaght. Already got pulled over once and the cop didnt notice but i'm sure that wont happen every time.

**pinoyesv6** · 01-18-2004, 09:14 PM

taking out the cat is BAD. its not some small state offense. its a federal offence. by law ur not supposed to remove your cat unless its broke or you have a certAin amount of miles on it. and even if you do that, you still have to repalce it with a cat.

**sabzi5858** · 01-18-2004, 09:16 PM

just a few notes: black smoke is not the result of having no cat, it is the result of running rich. the smell from the hollowed out cat is most likely because sulfer is being launched out with your exhaust, much as a cat that has gone bad (smell like rotten eggs? that's sulfer. having no cat should not make any smells). and as to using more fuel, having a more open exhaust is going to let your engine let in more air, so will need more fuel to burn with it, more power=more fuel. on the up side, less stress on engine parts from the more open exhaust.

on a more specific note, i personally have a 3" turbo-back mandrel bent, with 1 dynomax bullet resonator, and 1 dynomax ultraflow muffler. read: 3" straight through, no restrictions other than the turbine wheel, and that's a restriction i am not willing to get rid of. no black smoke, no stench, and gas mileage is about as good as can be expected from my driving habits and however much power is being layed down. (i do atleast 3 3rd gear pulls everytime i drive the car, and usually more than that)

i've been told the fine for not having a cat is $500, but that info could be wrong, and it may vary from state to state. sorry i didn't see this thread earlier before you decided.

Mindless · 01-18-2004, 10:14 PM

<div class='quotetop'>QUOTE(JiP)</div><div class='quotemain'>eclipse wont fit the flange on it is like angled ours are both straight. Â*An exhuast shop could defntly do it. Â* I have only the front "downpipe" cat, my second cat has been removed for years I pass insepction everytime.</div>

Not true..the OBX cats that have for the 7g are the same part number as the 2g eclipse.

**krazienluv10** · 01-18-2004, 10:56 PM

try looking for test pipes those are usually direct bolt on...ebay usually has them sometimes

redboy · 02-08-2004, 08:25 PM

<div class='quotetop'>QUOTE(sabzi5858)</div><div class='quotemain'>just a few notes: Â*black smoke is not the result of having no cat, it is the result of running rich. Â*the smell from the hollowed out cat is most likely because sulfer is being launched out with your exhaust, much as a cat that has gone bad (smell like rotten eggs? that's sulfer. Â*having no cat should not make any smells). Â*and as to using more fuel, having a more open exhaust is going to let your engine let in more air, so will need more fuel to burn with it, more power=more fuel. Â*on the up side, less stress on engine parts from the more open exhaust.

on a more specific note, i personally have a 3" turbo-back mandrel bent, with 1 dynomax bullet resonator, and 1 dynomax ultraflow muffler. read: 3" straight through, no restrictions other than the turbine wheel, and that's a restriction i am not willing to get rid of. Â*no black smoke, no stench, and gas mileage is about as good as can be expected from my driving habits and however much power is being layed down. Â*(i do atleast 3 3rd gear pulls everytime i drive the car, and usually more than that)

i've been told the fine for not having a cat is $500, but that info could be wrong, and it may vary from state to state. Â*sorry i didn't see this thread earlier before you decided.</div>

thank u mang u summed up what i was goin to say!!!!!!
its kindof mixed as far as if it is better performance wise if u should keep the cat or not.....take it out u lose low end torque but gain high end horse, i gutted mine and its a very small icrease in power, but nothing i would brag about. ide put it bak in if i still had it. as far as fines are concerned, i just hope u dont live in cali,1000+ duckets, easily. but like he said it varies. i live by neworleans and they dont chek for emmisions by me, so i dont care....

**JiP** · 02-10-2004, 11:35 AM

I FELT no real gain not having a cat installed. I also passed inspection here in NYC with no cats on the car.

And for the flanges...OBX is a crappy company in the first place, but if they are selling the same part to eclipse and galant guys, one of the two will have trouble mounting it unless there is a difference between 95-96 eclipse and 97+

Mindless · 02-10-2004, 12:27 PM

<div class='quotetop'>QUOTE(JiP)</div><div class='quotemain'>I FELT no real gain not having a cat installed. Â*I also passed inspection here in NYC with no cats on the car.

And for the flanges...OBX is a crappy company in the first place, but if they are selling the same part to eclipse and galant guys, one of the two will have trouble mounting it unless there is a difference between 95-96 eclipse and 97+</div>

All I know is that the stock part number for a catalytic converter for the 2g turbo and the 7g are also identical. Also, I've had no complaints so far.

**sabzi5858** · 02-10-2004, 11:32 PM

<div class='quotetop'>QUOTE</div><div class='quotemain'>thank u mang u summed up what i was goin to say!!!!!!
its kindof mixed as far as if it is better performance wise if u should keep the cat or not.....take it out u lose low end torque but gain high end horse, Â*i gutted mine and its a very small icrease in power, but nothing i would brag about. Â*ide put it bak in if i still had it. Â*as far as fines are concerned, Â*i just hope u dont live in cali,1000+ duckets, easily. but like he said it varies. Â*i live by neworleans and they dont chek for emmisions by me, so i dont care....</div>

no problem.. removing a cat should not reduce your power anywhere in the band. you are removing a restriction allowing better flow of exhaust gasses, increasing power, and reducing stress on the engine. backpressure does not increase low end torque. the reason why you lose low end power by using a larger diameter exhaust is because the exhaust gasses cool more quickly, the exhaust pulses are not optimally sized, etc. that creates backpressure at lower rpms due to the less exhaust gas flow. i posted links to this before, but i don't remember the site, and i don't have time right now to find it. please search on this matter if you do not understand it. by the way, whereever torque is increased, so is horsepower: HorsePower = Torque * (RPM / 5252)

the reason a larger diameter exhaust usually reduces peak torque while increasing peak horsepower is because at rpms lower than 5252 torque is higher than horsepower, while at rpms higher than 5252, horsepower is more than torque. In addition, stock or near stock cars tend to have their torque drop off at higher rpms.

mjc1055 · 02-10-2004, 11:45 PM

<div class='quotetop'>QUOTE(pinoyesv6)</div><div class='quotemain'>taking out the cat is BAD. its not some small state offense. its a federal offence. by law ur not supposed to remove your cat unless its broke or you have a certAin amount of miles on it. and even if you do that, you still have to repalce it with a cat.</div>

does that include buying headers/downpipes for teh 8g? would the fine be as big for that, if you got caught? I was considering getting afteremarket headers for my cali 8g (i live in california, too) but i dont wanna have to pay out the butt for tickets.

**Jay Garrick** · 10-21-2009, 09:14 PM

Are there any negatives for removing the cat? will it affect the o2 sensors?

**RedLine DOHC** · 10-21-2009, 09:31 PM

as far as I know removing the cat will cause the O2 to read wrong... thought the pre cat o2 helped the ecu regulate the fuel map. with the cat gone would the ecu not get a lean running condition from the pre cat O2 sensor?