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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?



They probably won't be worse, but maybe not quite as good. And, it may well be that they are making a CYA statement because they just havent had time and money available for testing, so they don't know how well it would work. They put their pipes on a stock 800 engine and tuned for best power gain. If you change the engine size a bit or open up the intake system, the overall tuning changes. With other changes, you may not see the claimed 28% power difference between stock and TB pipes, but you will still see a respectable difference.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python