i don't understand all these people who advocate getting the 65mm TB. unless you replace the mass air pipe as well you are only going to get better throttle response, NOT more power. the mass air pipe is the most restrictive part of the air intake. if you want better throttle response just bore out the stock TB and buy a UDP and save yourself $130 bucks. unless of course you plan on replacing the mass air pipe as well. then the 65mm TB is worth a damn.
MAC udp at www.poorboysperformance.com i think mine was like $75 shipped w/ the belt. i think that would be the best mod for your money. then maybe a motor mount bushing for the extra jump off the line for $17.