Which engine mod do you think is best for $600 or less? Here are the things I am debating: Fidanza flywheel, JWT S3 cams, JWT ECU, NOS, 2 Pulley set. Obviously NOS will add the most, but I want all the time power. I already have a CAI, Bored MAF, CM Stage 3 clutch, Primera header, cat back exhaust, JDM 10:1 motor. Thanks for any help.