There's not really a whole lot of options available in the UK, and because the bike has now been discontinued (and was never a huge seller in comparision to MX etc bikes) most of the aftermarket guys have stopped producing systems for the 650R - getting a silancer should be easy enough from old shop stock, bu the headers you'll proably have to take what you can find.
Don't be fooled or worried about 'massive performance increases' - most of that is pipebenders bullsh!t... That said, the 650R actually has pretty skinny headers as stock, so a few extra mm on the head pipe is actually a good thing, and isn't going to make the bike into a monster - just put it 'back' to how Honda would have liked to sell it in the first place I imagine...
I'd have a look on eBay, or see is XRStuff have anything left on the shelf perhaps?
xxx
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