Quote: So what they are saying is that the Tbikes are designed so that any jetting or airbox mods would likely make them perform worse, right?
That's exactly what I was told by TB before buying a pair. Could be a marketing gimmick to set themselves apart from the rest, but I believe what they say (ask for the modded dyno curves). But I believe the tinkerers here (Dinqua?) will differ, so YMMV. Another bit of info is that the performance increases are less on the '05 SM's because of the reprofiled cam that year.
