Phew, you are new. Let me educate you as best I can. On the suspension, yes, coilovers are all adjustable (at least all I know about), some springs and shocks are adjustable, depending on which you buy. Coilovers usually cost between $900-$5000, depending on how fancy you'd like to get. Spring/Shock combinations are cheaper but aren't as well tuned and you may run into problems. Yes, you're stock rims, unless nice, would look stupid on a dropped car. The stamped out chompies with hubcaps would be a waste of time. Buy some better wheels if that's the case. Exhaust wise, if all you want is a loud sound, just buy the muffler. My suggestion, if you want a loud GOOD sound, buy a high quality cat-back system. Mufflers sound like lawn mowers and don't offer much of a power gain. A high quality one will sound like a refined racing engine. People who know about cars will laugh at you if you do the cheapy muffler only exhaust. Everyone else will just think you're having car trouble. Anymore questions, just ask. I'd like to save as many as I can from "rice" syndrom or just doing things wrong out of ignorance.