If you look in the mods section of the site you will find all the info you need on how much to up it by etc. The surging cannot be completely removed by this im fairly sure it will take other mods, try a stage 1 filter (DNA or K&N) and PM kev for details about his fueling mod or a power commander.

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Tom

2008 White 660x - K&N stage 1 - DNA Stage 2 - Kev Fuel Mod - Airbox Drilled - Snorkel Removed - C02 + 20 - MTC pipes - Xenon bulbs - Iridium Spark Plug - Crash Bobbins - Barkbusters - Kev Fork Spacer Mod - Small Plate -