i was wondering who would have the best exhaust system for an es. whats the most hp gain you can get

 

I recently purchased an almost brand new lancer ES 2005, with less than 2000 miles on it. I defiantly looking to get wheels/spoiler/exhaust system. I have a good idea regarding wheels/tires but no clue with the exhaust system. Also anyone know spoiler models that look good on a lancer ?. also does an exhaust system affect my car gas mileage ?.

Appreciate the suggestions!

 

This is a well covered subject.

This link is your friend.

 

This also doesn't belong in the tuning section