I'd have to say you will NOT get the performance or pure engagement from a tuned 135i that you will with an M3. I know, beating a dead horse. But unless you really go balls out, which a Dinan tune is NOT, you won't beat an M3 in any performance category. The only time I've seen a 335i barely edge out an M3, straight line have you, is on a full blown race gas JB3 tune plus many more bolt ons. In the corners, not even worth discussing. If you are looking for something more fuel efficient, that may be an argument towards the 135i.
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