All you guys that have gutted cats how did you rid of the OBDII bullsh*t? (the check engine light and rich fuel mixture)

My CEL turned off after about 1 week with the gutted cat and has never turned back on, even after resetting the ECU.

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Perf:
KYB AGX Struts
Neuspeed Sport Springs
5 Strut Bars (2 F/U, F/L, R/U, R/L)
Sprint Front Camber Kit
$15 Rear Camber Kit
Corbin's A/F Gauge
MSD DIS-2 Ignition System
Some Regrind Cams that need High Compression (which I don't have)
Ported Intake Manifold
Ported Throttle Body
Drop in K&N Filter and open airbox
Custom 2 1/2 inch exhaust with Dual DTM Muffler
Empty Catalytic Convertor
Energy Suspension Motor Mount inserts
Hurricane_GS Short Shifter
Symborsky Shift Kit
Clutchmasters Stage 3 Modular
225/50/16inch Wheels and Tires


Audio:
Alpine CD Head Unit
Alpine Flex4 25W X 4 for Fronts and Rears
Alpine V-12 450W X 1 for Subs
Infinity Reference Series 5 1/4 and 1 inch tweeter component systems for fronts and rears
Blaupunkt 3 way 6x9's in the rears
3 MTX 5000 10" 12 ohm subs running 4 ohms mono

How do i go about gutting my cat??
I was thinking about getting a high flow, whcih should I do?

what is CEL(check engine light)??
i thought it ran your A/F ratio rich?

gutting cat won't change your A/F ratio.. the first O2 sensor (before the cat) tells the car what A/F ratio to use, the rear one is just for emissions (letting the car know if the cat is working) and has nothing to do with A/F.