here is a solution, buy a qr20dd swap from japland. if thats too much money for you, just buy the crank, but you wont have the nice direct injection system to play with. qr20 revs upwards of 7000 stock with no problem. throw in a set of forged pistons and thicker rods, balance the rotating assembly, and there you have you high revving turbo motor that would even put a good s15 build to shame, (remeber just how well this head flows) Qr's are not so bad.