i have the rfactor file for a e46 m3 somewhere i could check what's faster in terms of ratio. quarter mile i think 4.10 might need the extra shift.
the roadster is definitely slower stock (bmw made sure, they put 3.15 diff with 5 spd) but with the 3.73 its considerably quicker and fun as shit off the line. i still think i prefer my newly purchased e46 m3. it is a lot more on insurance though
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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, bunch of go-fast stuff