Whoa! I want your dyno! My stock racebike has 113 with a full Over Ti race exhaust, BMC air filter and Bazzaz. And it goes pretty hard, I reckon. A good R6 with stock headers + aftermarket mid-pipe and muffler is around 110. Hell, some even with a full system are around 110. The stock headers aren't terrible, and there's not usually a massive improvement with a full system. You can save a bit of weight though.
You only get really significant power gains from internals. The biggest improvement, bang-for-buck and reliability-wise, are slotted cam wheels (on stock cams). R6s have way too much overlap from the factory (and often the stock timing is quite a way out, apparently), and they greatly benefit from dialling out the overlap, with no downside at all - there's simply no adverse effect on the engine besides the extra ponies. This mod is probably an extra 8hp, give or take, all else being equal.
Then with all the major internal stuff, it seems it's only as good as its last refresh, cos the uber-trick, full-blown YEC supersport bike I just bought, with cams, valves, velocity stacks, thinner head gasket etc is frankly nothing special. I was very disappointed, and obviously need to get it on a dyno (and pull it apart for a look-see inside) to find out what's going on. I suspect it's not fuelled right, for a start, but I'm also sure that they need refreshing much more regularly than a stocker to maintain their performance.
Q2: Tuneboy
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