I have a K&N CAI and U-Bend delete. The 3.5 is the only pulley that doesn't require hardly any mods. When downsizing to the 3.4 though...thats when u need the DP, PCM, colder plugs, and t-stat.
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2003 GTP w/ Custom CAI, U-Bend and Resonator delete, custom 3" exhaust w/ Flowmaster 40's, ZZP 3.5" pulley, ZZP TB spacer and heat shield, NGK TR6's, and ZZP PCM