My 91TT blew a Turbo and I am having to replace them as well. I upgraded to 555 injectors, JW chipped and exhaust. The 675's were recommended to me, but I really don't want to have to drop another 1000 for the manifold. I don't race the car. just cruise and enjoy the legacy of the Z. What is the best all around turbo's that kick ass without the lag of the monsters?