Look on Ebay. There are plenty of 3 inch mufflers cheap. I got an N1 knockoff for $40 and I was gonna use it, but I got a hell of a deal on my HKS Carbon/Ti. The muffler was actually pretty good quality, nice welds, full stainless, even came with a silencer. The only diff between it and the "real" N1 was the lack of "Apex-i" logo.