+1 for kaizen. They see a lot of z and g cars. Went from 285 to 312 hp and from 237 to 260 tq and picked up ffs and lc. Passed inspection and emissions. They recommended high flow cats or test pipes but I have stock cats, I prefer driveablility and comfort over more power (it already has plenty). Tuned over a year ago and no issues.
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z1 post mafs / k&n / ark grip / avant garde m368 / re-11 / quaife
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