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Advantage to removing cats from 4th Gen?

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  • #1

    Advantage to removing cats from 4th Gen?

    What advantages would I get if I removed the cats from my 97TA, and bought cheater plugs for the O2 sensors?

    I know its definatly going to get much louder, which is cool.

    What about horsepower? Will I gain anything?

    Emissions here in Milwaukee no longer tests the output of the car, as long as you aren't throwing any codes the computer check passes your car. So I figured what a great time to remove the cat converters!

    I have the stock Y-pipe and I have Edelbrock headers, and Edelbrock cat back. How would I go about removing the cats? Get a new Ypipe?

    Thanks!

    ...Tim
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  • #2
    You will most likely set an EGR flow code because the EGR system requided a certain amount of backpressure to work properly. The solution would be to get a custom ECM program to delete the EGR. It's also going to be pretty loud as the cats are a very effecient muffler.

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    • #3
      Well

      What about horsepower? If the O2 sensors are fooled, how can they properly provide feedback to get a perfect air/fuel ratio going into the engine? If they are fooled, then isn't the car going to be stuck at one air/fuel ratio, causing rich and lean runs, depending on conditions?

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      • #4
        Originally posted by Timbers
        What about horsepower? If the O2 sensors are fooled, how can they properly provide feedback to get a perfect air/fuel ratio going into the engine? If they are fooled, then isn't the car going to be stuck at one air/fuel ratio, causing rich and lean runs, depending on conditions?

        I believe mixture is decided with the front sensors. The rear sensors are strictly to monitor the efficiency of the cat. I could be wrong...
        Tracy
        2002 C5 M6 Convertible
        1994 Z28 M6 Convertible
        Current Mods:
        SLP Ultra-Z functional ramair, SS Spoiler, STB, SFCs, Headers, Clutch, Bilstein Shocks, and TB Airfoil. 17x9 SS rims with Goodyear tires, 160F T-Stat, MSD Blaster Coil, Taylor wires, Hurst billet shifter, Borla catback with QTP e-cutout, Tuned PCM, 1LE Swaybars, 1LE driveshaft, ES bushings, White gauges, C5 front brakes, !CAGS, Bose/Soundstream audio, CST leather interior, synthetic fluids

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        • #5
          Originally posted by TraceZ
          I believe mixture is decided with the front sensors. The rear sensors are strictly to monitor the efficiency of the cat. I could be wrong...
          You are correct.

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          • #6
            Gutting cats definetly helps. Have you ever seen the inside of one? Especially with headers you will notice a difference. Also get an off road pipe to replace your cats unless you just want to gut them and put a pipe through them.
            1994 Firebird Formula, M6, Fan switch, 160 thermostat, Pacesetter LT headers, Morosso CAI, TB bypass, True duals.

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            • #7
              Another alternative would be to replace the Y-Pipe with one from Random Technology. Their high-flow cats have been shown to out-flow most high performance mufflers. These are a good performance upgrade, and you'll be keeping the air cleaner The only problem though, is that they're not cost-efficient.
              1996 Arctic White Z28, A4, K&N CAI, TByrne MAF ends, BBK Twin-52mm TB, TB Bypass, SLP 1 3/4" Shorties, Richmond 3.42's, Dynomax Bullet Muffler W/Turn Down, BMR Adj. Panhard, EIBACH Pro-Kit, AFS ZR1 Wheels W/17x11" out back!

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              • #8
                i have the flowmaster cat back system and it rusted out at the cat so i cut my cat off and welded a straight pipe in now it sounds and runs like crap i wouldn't do it to my car

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