6G Celicas Forums

does ne have a test pipe or straight pipe on there car as everyday driving? does it really give some power? how loud does it make the car? and where did u guys get it

Isn't all that stuff illegal in Cali?

it is if they catch u.

true but how many cops are going to look under the car?

anyway i smell thread lock or deletion soon xD

why? ^

every modified exhaust is illegal for the most part.
either for being modified. not having cats ect.


dont bother with a test pipe, get a whole exhaust system from the header back.

ne one know where i can get one?

iuno becuase one of the mods might be blah blah dont post illegal stuff blah blah

Any muffler shop'll do it for you. And to make things cheaper, you can always bring in muffler, headers, high flow cats, ect. and just say you want it put in.

Actually even my under the table guy won't make you a "cat defeating device". he will however let you use his back parking lot to remove the cat yourself and then he'll weld the rest up for you so that he can say he removed no smog equipment

Open downpipe FTMFW [BTW - I can honestly say, having gone back and forth a few times here recently, open downpipe opens up a bunch of top end. Might just be as opposed to a Greddy SP2 tho - it's a bit restrictive for a 3S ]

This post has been edited by DEATH: Jun 10, 2008 - 3:52 PM

open dp i so loud!

But beautiful Kind of hard to keep the sleeper thing going like that tho [In houston noone thinks Celicas can be quick so it doesn't matter if you're decked out like the Pike's Peak Celica - everyone will think you're slow - thankfully ]

Next exhaust mod will be an electric cutout and to install the magnaflow high flow cat I bought after that. So it'll go:
Custom downpipe/bpipe->electric cutout->magnaflow cat->Greddy SP2
Super quiet till I press that button

This post has been edited by DEATH: Jun 10, 2008 - 3:58 PM

I have a straight pipe running from my ebay headers back (save for a stock catalytic which I'll be replacing or eliminating in the next couple of months), and although I haven't dynoed the car, the entire air flow kit (headers, 2.5" straight pipe, flowmaster carbon fiber muffler, K&N 57i kit) reduced my 0-60 speed from a pitiful 12 seconds to about 9 seconds. Once I put in a new intake manifold and cylinder head, I'm hoping to get in the 7-8 second range. From what I've seen from dyno reports, most OBD II aftermarket cats offer improvements of about 5 HP over stock, and -1 HP over a test pipe. So, I think it's worth the 1 HP to not get a ticket every time you go for a ride.

They might, if somebody tattle tales on you (muahahahah)

Get a high flow cat, kill the planet a little less. You never know who might get tired of people stripping their smog equipment and report you to the EPA.

Yeah, since I replaced my headers, i've been running cat-less. I dn't have money atm to bring my car to a shop for them to build me a custom exhaust.
But I remember reading somewhere that for our cars we actually lost power or something due to not running a cat. Don't ask me where or how, I just remember that on the back of my head.

I have a 2.2 Celica with a straight pipe from the headers back. As a muffler I put a double exhaust muffler tip. It sounds really loud but doesn't sound ricey. (Atleast not on my car)

I have been pulled over in Huntington Beach and had the cops pull out the mirror on a stick thingy and look under my car. So, it does happen.

I have a gutted catalytic converter, but when he looked he could still see that there was a cat. so he didn't cite me for any smog mods even though my header is illegal too. All I got was a ticket for no front plate.

I do know plenty of people who have never had a problem though. imo a straight pipe back is the best option.

kool thanx guys i think im going to buy a stright pipe then get the stock cat heat shield and weld it on so it look lagit

They loose power from lack of back pressure. NA engines need a certain amount of back pressure to work properly. Turbo charged cars dont need exhaust back pressure because the turbo itself creates back pressure.


Gutted cats aren't much of a help. the pipe has to be the same diameter as the system to get the best result and keep the gases flowing at the right speed.





I passed my NCT (national car test, every 2 years) today so ill be ordering a decat asap. i'll keep the cat for swapping it back for the next test. You can loose some low end torque if your exhaust system is too free flow but you make it up at the top end

This post has been edited by Ronan: Jun 15, 2008 - 4:53 PM

i figure this is kinda a noob question but if you stright pipe it or gut the cat how do u get it to pass inspection? or do you?

^ you don't it will fail without a cat. just get a lagitamate high flow cat and decent exhaust. your not gana get much gains with a straght pipe, maybe a little but not worth it.