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I'd try contacting Janspeed (I'm assuming you are in the UK) and purchasing the downpipe by itself. I suspect that a good portion of the power gains they claim are due to the longer, and possibly larger diameter, secondary pipes they use. If that isn't possible, then as tksmr2 suggested, you could have any decent exhaust or race fab shop build you a new downpipe to replicate the janspeed piece. Worst case scenario, modify an original downpipe to fit the janspeed muffler.
Caps lock = shouting.
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