O/R Hpipe and Brenspeed tune..how much HP gain?
04-09-2008, 03:38 PM
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O/R Hpipe and Brenspeed tune..how much HP gain?
What's your estimate here on RWHP gain from putting in O/R prochamber in place of factory piece and getting a mail order brenspeed tune for 91 octane? (93 not sold here).
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