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Just keep in mind the power curve. NA motors and high strung 4 banger turbos rely heavily on torque multiplication to get into and stay in the powerband. An N55, especially a tuned one, had a very broad torque curve which means the torque compensates for the lack of gearing and it allows for less shifting in a track situation.
On a drag strip, I doubt a deeper gear set will make much of a difference. It will certainly feel faster by the seat of the pants.
I think the 6MT N55 M2's gearing feels perfect and it's effectively a 3.2x compared to my M235's 3.08. I just couldn't justify the cost over the MP LSD. Plus a clutch based LSD, especially the one built by Drexler for BMW, is so damn good for the street and light track duty. Lockup percentages are perfect. They are more aggressive than you'd think. Totally changed the car.
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