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57mm throttle bodies

Change out the Tigcraft chip they are very poor , customer had one in his bike & I wondered why it felt so sluggish took eprom out & put one of my German race chips in & bike felt like it doubled in power right thoughout the full rev range ... chip was given back to customer in a box & will stay there . Excellent systems but their Eproms aren't to the quality of their exhaust
 

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