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valvetrain upgrade

  1. best mod for around $500

    Intake
    i have a 99 buick gse thats mostly stock. I put on a 3" dual exhaust, with 3" catless downpipe o2 emulator,intense pcm,slp cai,tr6 plugs,180 ts and a zzp 3.4 mps. It feels like theres still a little kr and im undecided on which mods to do next for hp and kr reduction. Ive been thinking about...
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