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Friday I ran into (figuratively) the owner an '05 M6 with Borla exhaust, Ligenfelter CAI, and a Superchip tune. The car sounded great and he thought he was getting about 60 additional hp. It seems to be a good choice of bang for the buck. My '05 M6 is stock (but for the skip shift delete) but this combination has me considering spending the $2K.
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