If you're looking for a cheaper option, perhaps a 'Yoshi Box' ECU remap might be better.
(Just found a post I'd previous written around it nearly 2 years ago):
Quote:
I've had my K6 fuelling altered twice now since fitting my Twin Renegades...
First was at Rhencullen in Hinckley, Leicestershire, about 2 years ago. This used a 'Yoshi-Box' or 'Yoshimura Box'. This was about £65 if I remember right and altered the fuelling up to 5% in areas where it was needed.
This seemed fine, stopped the excessive backfiring (foot long flames out the back!), but didn't get get good economy, and it used to drink quite a bit of fuel and oil!
Then a few months ago I had my cans shortened and had the ecu fully remapped at 'Hill Top Motors' in Earl Shilton, Leicestershire. Cost £300 for the twin cans to be shortened and for the ecu to be fully re-mapped for the new cans.
Expensive, but VERY worth it. Its now better on fuel, doesn't drink as much fuel when cruising, and gives a small, but noticeable, amount of extra power!
The Yoshi box did the job on the cheap, but if you can afford it a full ecu remap is a lot better 
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