ok thanx that helped alot. maybe i'd just go for the limit of about 550hp, so i wouldn't need to do a hefty upgrade. that should also stay nice and economical for road use and wouldn't cost much to get it to that stage.
i don't have heaps of money to play around with riht now, maybe a further upgrade later on.
sorry i ask lots of questions, but any ideas on how much a nitrous system would cost to purchase and the ease of self-installation?