I meant following Suzuki because of the disgusting exhaust on the '05 GSXR 1000, not their new 600. That was the first butt-ugly exhaust that was meant completely for performance.
I had a ti exhaust on my race bike last year and no problems at all with wheel changes, but that was without removing the rear caliper so that might be an issue. As far as weight, you can pick up a full length titanium slip-on with two fingers, the 1 lb. weight savings to me mean nothing on the track and neither does the CG. With the stock exhaust ir might make a big difference but who keeps the stocker on a race bike anyway?
Either way, to me the aftermarket exhausts on '06 look like little dicks sticking out of the lower. If they could at least come out with something comparable to the pipe they ran on the MotoGP bikes (when they had them) it would be kick-ass. They at least had an upward angle and looked like race exhausts instead of garbage.