I have both. I've had the 335I for about a year and a half and loved it....until I drove the e92 ONCE. there is no comparison between engine power and a smooth well torqued engine vs the 335I. the 335 is great on gas and may have a little more speed at take off but I personally love the growl of my M3. I got a ton of compliments on my 335 with the only mod being low pro wheels and tires but the M3 is much less common and whole lot more fun to drive.
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