Does putting on a straight pipe and getting rid of the cat throw any error codes to the ECU or any other problems I should know about. Thanks.

 

the main problems would be that it results in zero gains and pollutes the air....

 

just get a high flow cat, but youd probably gain the most 1hp

 

You are correct.

 

And your exhaust will smell nasty..

 

some say it will smell like rotten eggs, and others say old sweat socks in old half empty milk jug ?

 

my friend with an eclipse GSX is running a straight pipe, and it smells like an old muscle car, very gassy.

 

ive got 1 and dynoed +12 hp/tq!!!1111

 

99 cali, warpspeed y (mandrel) + custom maxima resonated test pipe, stock cat-pack. smells gassy when it's sitting there and you're outside, other then that the sound is pretty much stock, alittle raspier. no ecu codes

 

I believe it...it is basically the same concept as adding an aftermarket y-pipe which removes the pre-cats from the stock y-pipe.

 

He's kidding.

There's no need for a NA car to remove or upgrade the cat. Your car is not producing enough waste gas that the cat will be a restriction. If you insist on following this route and not throw a code, you will need an O2 simulator to trick the ECU.

 

No you dont. I think it depends on the year of your car and the location of the O2 sensor.
Ive been running a straight pipe for years and ahve had no codes, but I can confirm that smelly exhaust,...rotten eggs!
If you cat is operating fine, just stay with it. The straight pipe is a cheap fix if you have a faulty cat.
But you will fail emissions with it.

 

So what did you do with the O2 sensor that's in your cat?

 

Its plugged into my test pipe.

 

I did it and I regret it, smells like pure gas comin straight from the pump while it idles and the noise just gets flat out annoying after a week.

 

No its not the same concept as adding a y-pipe, the gains in the y-pipe come from straightening out the flow http://www.motorvate.ca/mvp.php/519

 

the side affects are a 5,000 dollar ticket and getting ur car impounded. why take the risk?

 

This ain't the 70's,man . The cats take a lot less power than those old setups did. Nowadays, all a "test pipe" does is gain .5 horsepower in exchange for a trip to the impound lot. With the use of Y-pipes, why would you need a Straight-setup anyways?

 

Cat>no-cat......

 

True Story!!!!!!!

 

in so many different ways too

 

I guess I have had good luck with mine or something. No nasty smell, no god-awful exhaust moan, a slight gain in performance.....the only down-side I have is that my CEL comes on and when it does it drops my 1/8th E.T.'s by 2 tenths

 

Thats what mine smells like, and I have a Hiflow cat.

My old test pipe smelled even more gassy. Keine Eier, and no socks. Not really noticable in HP though.

 

no problem with mine, quite like a house mouse, no nasty smell, budget y-pipe install, stock muffler

 

You are going to kill the enviroment with your straight cat.. you do know that right...

like 2 Da MAX said get the high flow cat...