I beat the piss out of my 325iX for years, the only thing that ended up giving up was the M20.
I'd just add that "marginally" slower may be an understatement. My iX was chipped, 5spd, has some weight savings, etc, and it still much slower than a regular 325i.
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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