Hi everyone. I'm a proud owner of a 98 Cobra coupe with only 40,000 miles. I have already installed 4:10 gears, 2 chamber flows and a K & N CAI. My question is where should I spend the next $500? Also, will I be able to beat my neighbors 98 T/A A4 with a 3 in. flowmaster catback and K & N air filter? Thanks in advance.