Racerx does indeed build them while Trail Buddy just sells them, and they're not the same pipe as racerx modifies his quite a bit. I have racerx's "Stealth" muffler while a friend has his "Super Stealth." Both are on stock bikes and they sound fantastic, with the Stealth being a bit throatier than the smoother Super Stealth. That was one purchase I've never regretted 'cause every time I start the bike up I get to hear that great sounding pipe.