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LOL Gerit, Joe has a Vortech in that thing sounds amazing too haha should probably get that put in your sig Joe.... also I think you will see some good dains even with Shorties since you are F/I Joe and I bet they will sound sick with you JBA's Axle-backs as well as bing smog legal and just 1 less thing to think/worry about.
Underdrive pulleys are great for some gains but if you couple them with a few more 10-20 hp mods, then by the time you are done youll feel some good gains.