The Flywheel is a worthwhile upgrade for you here. The only "downside" is when street driving you will have to adjust the to change in taking off. The stock flywheel is heave and carries a lot more ineria than the lightweight one will. The good news is there are probably more advantages to it than disadvantages.
For a car that I track a couple of times a year, I would defnitely do it.
As for the LSD, I would def. do one of those as well. My stock viscous LSD is junk on the track. It's actually crapped out on me just doing spirited driving on back roads. I've installed a few diffs for other guys, the Nismo and more recently the WaveTrac. The Wavetrac diff is probably the nicest that i've ever seen... and i've seen a lot! I would think most any of the aftermarket diffs are gonna be better than the viscous LS that comes factory.
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