The O2 sensor fits just fine, but whenever you remove the cat a CEL will come on, the PCM compares the air between the upstream and downstream sensor and if the readings are the same the CEL will come on to let oyu know your cat has deteriorated.
I'm not sure about the wire splicing since I wasn't actually there when the installation was being done, but I assume there was none of that.
I love the way it sounds, with my BTG CAI it's louder than a SRT-4, I tried it wothout the CAI and it's just like a SRT-4. I like it loud but not to the point where you can't speak in the cockpit.
You'll love it, trust me.
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Patriot Blue 5-Spd, Stage I, Mopar BOV, BTG Intake, Custom 3\" Turbo-Back, Spring Mod, BTG Shock Tower Brace, Vogtland Springs, Koni Shocks, Eibach Sway Bars, Azev Type M 18x8.5 wheels, Ventus K104 tires, Projector Bi-Xenon Lights, Rear spoiler, Autometer Gauges, Illuminated sill plates, K&N Oil Filter, Mopar subwoofer. Mexico City. See pics: http://www.sportcarsforum.com/forum/viewtopic.php?t=715
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