I believe it was around a 3500$ option. Pretty standard price for a sport package upgrade on a 3 series. Most later cars (like my '98) have sport package because BMW was doing a promo for the 328's with sport package.
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2002 TiAg M3 6mt
deoranged, dechromed, led tails, ZHP knob, UUC SS v3, GROM, OEM 220M 19's, Michelin Supersports
2006 YZF-R6, black, ohlins, pazzo, BMC, cat delete, vance hines csone, YEC racing tune,-1 +2