A hard top
Jk man. I used to have a 99 convertible gt and the hard top guys would bust my balls allll the time about how they are lighter lol. The pulley swap is definitely gonna make a noticeable difference. Get a new cat back to let her clear her throat and sing for ya. Lastly, a tune will go a long way. Unless you want to spend some serious money, I wouldn't do much more than CAI, exhaust, tune, pulley ... Maybe throttle body etc. you'll see some good gains and you're already noticeably faster than most modern cars. You got the goods .