I just put a magnaflow cat back exhaust and it sounds great. Go to magnaflow.com. You may even want to check out the nismo cat back system. i really wanted to getthat, but they don't make it for the sc models. Only the non sc's. If your budget is low, check out calmini's cat back at purenissan.com.(i want the calmini winch bumper next! lol) It costs only $269.00 verses magnaflow $439.00....but you do get what you pay for let's just say! lol. by the way.....it does sound deep with a 3.5 tip stainless steel all the way through.