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The .64 A/R is the only way to go IMO. From our experience with the GT675RS which are the exact same turbo, you do not pick up top end power with the .86 A/R because you can't even acheive full boost. The housing is larger than you need and you can't pick up enough velocity to spin the turbine as fast, even on top end. So not only do you gain response with the .64 A/R housing but you also gain peak power because the turbo will produce more boost. You get the best of both worlds going with the .64 because the .86 A/R housing is overkill for the 1.5L of displacement we have behind each one.
Russell Floyd Z1 Motorsports
www.300zx.com
1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance
Z1 Motorsports Exclusive Parts Line 2877 Carrollton Villa Rica Hwy
Carrollton, Ga 30116 770-838-7777
770-832-9253 (fax) 
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