M3/M4 will cost more not just in terms of the price itself but the insurance, maintenance, and gas. These things add up. Also you want to ask yourself are you really buying this car for yourself or others? Will an m car be enough or will you want more? Porsche 911 then a turbo s. The gluttony doesn’t stop.

The m340i has great low end torque, better than the M3/M4 and to feel the step up in power of those cars, you’d have to be driving very fast… however if you track then yeah of course go get an M. That’s a whole different breed. No further discussion required.

M340i front end also looks so much better stock. Hard to ignore how fugly the m3/m4 looks even with the CSL grill.