This product is designed for the 97-07 supercharged Series II or III:
Available In:
3.5" for 01-03 GTP/GS with ZZP PCM, Tstat, colder plugs, bolt in downpipe, and a cold air intake.
3.5" for 2004+ Grand Prix recommended for cars with 1.9 rockers, Tstat, colder plugs, some exhaust work, and a cold air intake.
3.4" for 97-00 GTP/GS with ZZP PCM, Tstat, colder plugs, bolt in downpipe, and a cold air intake.
3.3" pulley requires a small cam or headers or any intercooler
3.2" pulley requires an XP cam or a full size intercooler or an SS intercooler and rockers or a cam
3.0" pulley requires larger injectors and a full size intercooler
Running a pulley smaller than we recommend will just make performance suffer, you will have KR. KR reduces full throttle timing reducing HP.
*Cars with open cone intakes(otherly known as "Hot air intakes") should run one size larger pulley.
**All recommendations assume 92 octane or higher
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