Back on the tow truck...

SurfDog

This might be waaay off but if it happens on right hand turns with less than half a tank of gas, it could be fuel starvation. (See phunk's fuel starve fix for details)

I get this at the track a lot. It feels like car misses or foot off pedal for a second or two then come back after you straighten out. (Note my track turn ins are very smooth even though high g. If your cranking your car around violently it night this problem might present differently)

I know a lot of guys carry a little spare gas, like a well sealed non smelly gallon, with them to reprime the fuel pumps in case of this. Lots of guys get pulled off right hang highway Ramps at 1/4 tank on this issue. The problem is partly that fuel gets trapped and unusable on the left side of the tranny hump in the tank.

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09 6spd Berk CBE, JWT cams, ZSpeed CSC, Stillen (25 row oil, brake cooling, sways, gen3 CAI), Passport (9500ci), Quaife LSD, Z1 400 hp kit, ss lines, pads, rotors, clutch etc, Phunk's pan and fuel starve fix