What gearbox are you running these days, I quess a standard set up is not man enough to cope
Gemini/VW Motorsport 6 speed 02A conversion, running semi-straight cut gears, uprated selector bushes & pins, synchros, additional 6th gear oil feed, Peloquin LSD, 4.2 FD, MTS Motorsport upper and lower shift tower bushes...and a very light 'special' flywheel.
The 'ultimate' NA 02A fast road/track gearbox, in my mind.
Standard could cope...but I wanted as closer gear kit...so it's now geared for 145MPH @ 7300 in 6th (fuel cut)....which it will pull.