Has anyone tried Yamaha's GTYR carbon-fiber or titanium muffler with the titanium header on a YZ250F or 426 or 450. Yamaha mailed me a discount coupon for $100.00 off a $500.00 or more purchase of their GTYR accesories if purchased by 1/10/03. Thought about a new exhaust for my 250F. Any feedback is appreciated.
