| gt525, jwt sport 600, gt600r and jwt 530 (ballbearing), or gt675rs and gt28rs (ballbearing) gt525 and jwt sport 600 will have your factory 4 bolt downpipe. but gt525 will lack that high end power of the others. sport 600s are probably what you are looking for. gt600r and jwt 530 will require 5 bolt downpipes, but will have more power than the gt525. gt675rs and gt28rs will require 5 bolt downpipes as well, and will have even more high end power. these also seem to be in the range that you are looking for. either way you will probably want better flowing exhaust manifolds and a dual intake. therefore, you might as well get 5 bolt split downpipes and go with the ball bearing turbos. in order to get 500-600, you will need more mods than you have.
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