I recently started to mod my gtp with the advice of many of the people on this website. The car has a k and n intake, zzp wires auto lite 104s iridium, 3' dp with high flow cat. U bend delete, borla cat back and a 180 t stat. I actually bought a 3.4 pulley with all these parts but did not install due to a lot of bad feedbak. I am also going to order a tuned pcm in the next couple of weeks, with the mods I have along with the pcm which size pulley could I upgrade too to make more power but not destroy my engine?