Ive been driving my 02 wrx for 2 years now and want to start moding it. im looking for any advice at all about what im looking for. for with the exhaust. i want to replace my WHOLE exhaust system. upgrade to something to increase performance and sound. i love the low low deep rumble. also thinking about upgrading the air intake without removing a foglight. and getting a COBB. any other recommendations? i want good performance while taking it easy on the engine.