I will be shortly getting a WRX anywhere from 02-04. Im really looking forward to the exhaust system work so I am thinking about getting an HKS Carbon Ti exhuast. would this be worth it and a good choice? Also I really want to get a BOV. Is there a difference in sound as far as different companies go? Im looking for something loud and if so are there any reccomndations on which companies would be better to go through?