Go get a new car if you want speed. Solara is NOT for going fast, but for going at a reasonable rate of speed and lookin DAMN FREEEKIN GOOD at it. Get suspension, rims, kit, HID projecter setup, and dual exhaust perhaps (though this is bordering on the performance aspect of aftermarket stuff, but get it for the low rumble COOL). I assume you already got a sound system to help the whole vibe out
And this point always gets brought up every now and then on the forum. If you want fast, go buy a G35. If you want to show up to those G35 owners, then get Benz E500. And if you want to show those owners up, get a BMW M5. THen if you want to show up those owners, get a..... The point is there is ALWAYS someone faster than ur ass out there. But there is NOT always some one out there lookin better or ridin clean. Just enjoy the engine you got, and work on looks cuz looks is where you actually sell the car to other ppl, whether they think its hot or not.