Quote Originally Posted by 03RCode View Post
Actually on our shop dyno the earlier FI bikes ran VERY rich, and with the exhaust off they are slightly lean, but not bad enough to really do damage. That's mostly pre-04 or so and at my elevation, newer bikes no chance in hell. My R1 was leaner than I felt safe with just slip on's and a gutted cat.
That makes sense. It feels the slightest bit peppier with no muffler, but I figured it was just all in my head because the noise. Hell, it may be. Still not sure if I'd wanna ride too hard with no muffler though, lol