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Old 14-11-2010, 08:06 PM
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Scott.T Scott.T is offline
Admin, Meets/Events Organiser.... formerly known as SilverSurfer
 
Join Date: Sep 2008
Location: Hastings, East Sussex
Posts: 9,485
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Standard airbox on a classic with a good quality filter such as Green Performance or K&N etc...are good for about 320BHP.
I ran one of these for years at over 315BHP. I then swapped to an Apexi Induction, and with a slight map tweak made another 15-20BHP and about 10lb/ft torque. But the map was adjusted to suite.
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