aside from my short ram intake and t/b, im going to add more power to my zx3. i know that pulleys are almost a must. ive read up on them and i found that they are substancially lighter then factory and dont give more hp just frees up the hp that it takes to turn the alternator etc. are they worth the investment? how hard are they to put on. i was also told by a friend that i cant really use them because of the system in my car. its 500w if that helps. i do have a capacitor for the system as well. thanks.