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Never heard of 750cc's unless you have them made by RC. The 740 Nismo's you'll need to have your lower Plenum machine to fit like mine below, so could be time consuming and will cost you more. The 555cc's ( Nismo's ) are drop in's and will be far more then enough for GT25's. Based on many other Z's running 2530's ( HKS ), TD05/16g's the TD04's , few PE1420's, the Sport 500's and 530's and 600's and whatever else is out there not pumping over 575 to 600rwhp, the 555's are just fine. Some go bigger for safety and there own piece of mind, but again not necessary. off a 1991 TT 
Also depends which GT25's you have as well. [ http://www.turbofast.com.au/GTseries.html ] Got dual Pops, ported exhaust manifolds, Fuel controller, ECU + programs, down pipes, testpipes, colder NGK's, what transmission? yet?
White 90TT under construction: Unorthodox pulley Autometer Phantom boost gauge Greddy Turbo Timer Greddy ProfecA Boost Controller Garrett GT25 BallBearing turbos HKS FMIC OBX exhaust ( ? ) POP Charger N/A rearend
 STAGE V++++ Going to XV+ and beyond :) Yellow Z STAGE II Going to XI+ |
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