rbs13, I was only have a tease of all my mates with Silvia's, it's an on-going rivalry. I think there great cars, and the power to weight is in your advantage. I was beaten on the day I got 411 by a Datsun 1600 with an SR20 pumping out 433rwhp, so I have much respect for the engine:D
MRK25T, I don't recommend pushing the stock turbo as hard as I did to get that sort of power, but I was planning on replacing it anyway, so we upped the boost. With an aftermarket turbo you should be able to make 340rwhp easy on just over 1 bar, if your not then something isn't working right.