i have a 2000 firebird with a SLP CAI. I was wondering would a aftermarket cat make it sound different and how much HP would it unlock?
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if by aftermarket you mean a high-flow, yes it will make it sound a little louder (cause there is more flow). You will only see what like 5rwhp gain, I'm not certain (if you gutted it or removed the cat you wont have as much low-end power).2k2 camaro, K&N, SLP whisper lid, Konis, AEM, HP Tuners, Angel eyes/Halos, CF SS ram air hood, 4.10s, Zexel Torsen, UMI SFCs, CrossFire, BFGs, Gatorback, Catco, Flows, and TLC! DONT feed the Trolls!
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