Nice car dude and for the exhaust the guy before me said the evo 2...yea thats pretty quiet and you will get like 1-2 hp gains BUT if u get any header it will increase to at least 5-10 hp and the header will probably give u five hp. When u buy the exhaust systems make sure to get a header too and make sure u buy the catback system because the catback system has everyting needed for the exhaust...muffler, piping, etc. Now for the types of exhaust and headers. For the Exhaust u should get either the Greddy evo2 like the other guy said or the apexi world sport 2 because it is also very quiet(even quieter than the evo2) and it gets better Hp gains than the Evo2. For the header u should get a comptech header(if u can find one) beacause it is one of the best headers ever made. Said that it can reach up to a 8-10 hp gain but nobodies really sure. Any pullys will be fine as long as their light weight and the throttle body spacer u dont need to do becuase ur car should be fine the way it is. Sooooo have fun!