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Old 12-16-2012, 10:20 PM   #3
Alex323Ci
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Join Date: Jan 2005
Location: Huntington Beach -Surf City USA
Posts: 17,140
My Ride: M3 & 323Ci (sold)
well our cars don't do a replacement "chip" per se, but software. but I got what you were asking. the M52BTU (which is the 323) does respond better than the 325/330 to software. but still nothing huge. you can get a custom tune or generic tune from Conforti SHARK INJECTOR. intake & exhaust aid the gains of the tune. underdrive pulleys help a tad but I'd save that for last.

you can do a lower geared diff ratio like 3:46 that helps performance, although nothing to engine.
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