i think 2.5" is a bit low...at that height you will encounter alot of problems later on, you will start feeling your car will bounce much more than usual, even if you replace your oem shocks with aftermarket shocks, your after shocks can only take so much, at extreme low height, it will not work as good as it surpose to.. all your under body will be scratch, everything to headers, exhuast piping, oil pan, etc... will be scratched and in the worst case it can be damaged beyond repair such as cracks and so forth. i think 1.75- 2" will be good. but if you want it real low, its up to you, you can do it no doubt about that. there are springs and adjustable coilover kits that will allow such a low drop. but i just wanna aware you of some of the problems you might encounter at that height