[Dave ZS-X]

wooohooo fantastic i cant wait to see some pics.!!

Sensible head on now......with 301 bhp and 340 and weighing 1005 kilos mine is silly quick, it out paces all sorts of exotica, however imo it could handle another 50 bhp as it stands and retain its composure. Mine has most parts modiified however, i dunno what spec yours will be but imo a good idea could be variable boost control because for a road zs at full weight 350 bhp will be pant dirtyingly scarey every time you plant the throttle (and you will need some good supporting mods to keep it all under control), then when conditions allow you can ramp up the boost and go super pursuit mode,lol.
i cant imagine what 450-500 will feel like, mine spins 3rd up in the dry ....it will be just incredible, good luck and keep us posted.