There is a guy that shows up at tracks in SoCal and lets you test his own exhaust sytems on your bike. He bolts them on and lets you spin laps with them and then takes them off for you. Really a cool deal. Anyways, I tried his system and was stoked with it. He charges $350 for high clearance header pipe and muffler and he has a spark arrestor available. On my YZ400 if improved power everywhere. My front tire was lifting absurdly easily and I was getting a lot more power to the ground. My bike is running a little lean on the pilot circuit right now and it seemed to richen it up a little there but other then that I didn't notice any really carb related problems caused by the change of exhaust. The guy is just trying to get his name and product out to the public and according to him he has some shops in SoCal stocking his systems. He's tried to get the mags. to test them but he's not a big $ maker yet so they keep ignoring him even though to me his product looked awesome. It's a very good looking exhaust system!!! Call the guy and ask him about it. He'd probably do a money back thing or something cause the guy is just starting out and trying his hardest to get his exhaust on as many bikes as possible. Each on is hand made.
Khris,
Here's his info from his card:
Bob Murray
Thunder Alley, Performance Exhaust Systems
1010 E. Lacey Blvd.
Hanford, CA. 9320
559-584-8109
Try calling the guy and ask him about it, I was very impressed myself and will buy one once I get the cash.:)