i have a 1994 sse whit series 1 in it and magnaflow ex. so i need a cat that will work better with the backend so info on what is good and performace gains involed

dump the cat. replace it with a straight pipe, see how that feels.

I totally agree!

Whack the cat!

I've heard that if you don't have any cat it would decrease the gas mileage, but I'm sure from the HP gains it would be nice. Does anyone know how much a new cat OEM replacement cat would be and then like a high-flow one. I know my cat is getting bad it stinks sometimes just from normal driving, I 've replaced the O2 sensor and every thing, cept the one on the cat would that make a diff.

look in jcwhitney or summit for a catco hi flo catallytic converter. you will probably have to get the universal one. I think it'* around 60 bucks. pretty cheap for a cat conv.

I got my high flow cat installed at Muffler man for 140 dollarsAmerican so Id go with the High flow other then a OEM cat that was 50 dollars more anyways.

just wondering but last summer i had my cat gutted cuz i was running rich it is filled up with crap but anyways after i got the car back i have no low end torgue but i got high end will just putting a straight pipe like buickman401 said help me at all, and how will it sound

If you lose too much backpressure, you'll lose torque. I'd suggest sticking with a cat, but hi-flow for sure. Mine gave me a little deeper rumble. Not overwhelming like a muffler can do, but just a hint.....sounds almost like an aftermarket cam if you know the sound.

Straight piping can get you in trouble, too. It'* a federal crime to do it, but not all states inspect. However.....if you DO get caught. OUch.

so i should get a new cat back on? what about if i run rich again ill have to buy another one, they aint cheap 150 installed and everything is that a bad price and do they test emissions in michigan?

Not sure about emissions in MI, but I got my hi-flow cat installed for 125, including the cat. Running rich again won't be a problem if you change you O2 sensor.