The aftermarket manifolds can only mate with the triangle mitsu TD flange and are very expensive. About $2500. Add on to that $2000 for turbo's and $1000 for waste gates. One of my Japanese friends has this set up with twin Td06 19C's - He also has a dyno slip of 620rwhp! I splurged on the engine because my current engine blew up but I can not afford to splurge on the turbo's :( As you know with the Z, nothing is cheap.