I have a stock '83 Z28 with crossfire injection and I'm trying to run mid 15's without killing gas mileage and my pocket book. I saw where everyone was recommmending Random hi flow cat's, but the ones I looked at were$300! I can do a lot of other stuff for that price. If I completely remove the catalytic converter, will it hurt performance? No more emmissions in OK., so I'm not worried about inspection. If it does hurt performance, does anyone know where to get a Random hi flow for less than $300? Any other suggestions for semi-simple modifications will be welcomed. Does anyone know how much this will increase 1/4 time? thanks

 

If you don't have to worry about emissions, then no cat at all is the best you can do. My friend took his off, and his 1/4 times dropped by .3 according to his g-tech.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End with 2.77:1 Gears.

Current Mods: LT4 HOT Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

Soon to Come: 7.625" 10 Bolt with 3.42s and Accel TPI Intake Base

 

Just get a cat-co cat, don't skip on the cat on a street/strip or daily driver car.

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"Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason, than that of blind-folded fear."

-Thomas Jefferson

 

I dont have a cat, and my quarter mile times dropped .4 seconds. if you don't need one, dont use one

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Steve
88 Firebird TBI(WS6),TH700R4 - Open Element, Cat Delete, K&N filter 14*4 element, Flowmaster Catback Exhaust, 180 Stant thermostat, Accel cap and rotor

 

Thanks for the help guys. Just one more question. I've been reading some things about getting a different O2 sensor, is this needed? thanks again

 

Yes. You must have the O2 sensor for the ECM to work properly or you'll trip the ECM limp home function and the EC light will come on. Unless you ditch the ECM entirely, the O2 sensor has to remain in place and connected...

 

If you dont want to spend the cash then get the catco,they are pretty cheap,but if you dont need it then dont bother,i just like the sound with a cat of some sorts on,it sounds too tinny without it unless you got some serious motor,i like a smooth rumble that sounds ballsey.