BOV's are supposedly very bad for the 04's - might have something to do with the ECU's. I've been thinking about getting one, but I'm not going to risk it. Future is right, get the uppipe/downpipe combo for some great power. If you have lots of money to spend - start looking at Cobb's AccessPort or any ECU upgrades by Vishnu/Cobb. A lot of people like to do suspension work first, but that's completely up to the owner. Enjoy the car man