hhmm...i'm using microtech too... my best time ahh....in the race 14++ with normal tyre, raining. but other day... hot day with semi slick...best time 13.73s averange 14s i guess. no LSD gearbox :( just ordinary 5sp gearbox.
Here is the tweeter..pioneer TS-T35
it's an old model actually..very2 ol skool...