You can go with some cat-bypass pipes. The CEL that comes on due to the O2 sensors won't affect your car's performance... It will just simply be on to alert you... Some people that get them on due to the bypass pipes or headers that remove cats just take the bulb out of the instrument cluster that goes to the CEL
P.S. I have a brand new set of Stebro racing cat bypass pipes if you're interested...
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Some stuff for sale: M030 S 24mm front sway bar, M030 base 19.6mm rear sway bar, 996 GT3 OEM Porsche Motorsport front strut mounts monoball "camber plates"
WTB: looking for some 5-7mm spacers with extended bolts
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