Just a thought but do any of you guys know of there being any serious differences between the various set ups for the yfz?

RPY's comment on low end v/s top end power was what really go me to thinking about how there are apparantly more obvious differences between pipes and silencers for other machines than the new 450's, or maybe its just that I have not seriously looked into them and am going by the more popular ones I have seen.

Honestly the only one that has not looked like nothing more than a larger headpipe and a hollow canister for a silencer was the DrD and that one was just mostly the shape of the canister being that of a D. It also didnt seem as loud as some others, but thats about it on being different.

So what ones produce different power curves and why?