installed a few sets of the GT525 from Z1, and they worked and fit well. I think the Sport 600s are NLA as well, they used to be pretty laggy but maybe with modern manifolds and upsized piping you could get them to perform better. To be honest if you are staying stock pining for ICs a set of Sport 550 or similar Z1 unit is the way to go with a 5 bolt down pipe. Otherwise a Z1 525 with a old school Dupree long split down pipe and 2.5 is the budget x performance.
Bernie Bilski berniebilski@cox.net President of Z-Car Club of Northern Virginia1995 Nissan 300ZX TwinTurbo in Cobalt Green 1997 Nissan 240SX SE in Ultra Red 2006 Nissan Frontier SE in Ultra Black
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