Originally Posted by @617DRFT_370z

Changing ur crankshaft pulley to a 6069 aerospace grade billet aluminum over the shock heavy cast steel one is worth the effort. Do you professionally tune cars using uprev osiris? Oh you dont? Then how would u know if u needed a tune for your pulley? Thanks for playing. No, you do not need a tune for a pulley. It is not affecting a/f ratio n it is not changing the load on the motor. Its just spinning faster. And yes, it may be "3-5hp, not worth the effort" (actually i dynod n found a gain of 6hp 4trq to the wheels) well lemme tell you something. All the mods ive done to add "3-5hp" adds up quick, real quick. I dont forum hunt nor do i roast forum dbags, but all you "i know everything" kids on here are the reason why nobody does pulleys, intake manifolds, headers. I have to put a stop to this, your all fools.
Theres a reason why my cars the faster n/a vhr in Boston n why most guys struggle to hit 300hp with full bolts ons.