D-Stock is not yet 'official', but the SCCA Solo SAC (Stock Advisory Committee) is suposedly recommending to the SEB that both the 128i and 135i be classed in D-Stock for 2008. The SEB will publish its Official classing in the SCCA Fastrack monthly.
As far as 'lag' is concerned I can't venture a guess yet how this will play out--I need more time in the car on course.
Keeping in mind it takes the OE springs and shocks (the car is definitly under-damped, IMO) a fraction of a second to take a 'set' when corning, I was impressed by the cars ability to go where I pointed it. It felt nimble in a very long 8-cone slalom, got good grip in sweepers and felt fairly neutral on entry and mid-corner, and allowed rolling into the throttle on corner exit without excessively upsetting balance.
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