The 0.57AR housing will defiantly spool faster the a 0.63AR housing. It will also not be efficient in the high RPMs. Its creates more back pressure & there for heat too. It all depends on what you use the car for. A tubular manifold would help greatly on reducing the inherent back pressure. The EFR turbos are NOT anything close to a "bolt-on" setup. As far as I know I'm the only Z to have a EFR twin turbo setup ever ever run. [ http://www.twinturbo.net/net/viewmsg.aspx?forum=general&msg_id=2516582&forum=general&dtSearch=1 ]
~Induetime~ "Lag Less" First Stock Turbo to break 500WHP on boost alone (Pre-E85). New track car project "Diseaze": http://arizonazproject.wordpress DOT com Custom fabrication for the Z32: search QFAB on Facebook:HREF="https://www.facebook.com/QFABrication/?fref=ts">QFab More custom fabrication: search FuturFabrication on Facebook: HREF="https://www.facebook.com/FutureFabrication/?fref=ts">Future Fab
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