Hi

I have a 1995 C280 with a Universal Hi-Performance Muffler. I have stock 15X7 rims on there and wanted to fit stock 98 SLK rims on there. Will they fit on without any problems. Is there anything I need to know. Also, how I can I make my car faster without speding much money. (I'm in college and don't have much to spend) Someone told me I could change the final drive gear ratios and increase acceleration 0-60 times. Is a K&M air filter worth it? Please advise. thanks

Troy