I don't see why that would be a problem. As long as they hold boost without leaking, that is all that should be considered. Some of the guys running "higher" boost on KA-T, SR, and CA setups (like 16 PSI ish) were having issues with the early ones, but I haven't heard anything bad about them in a long time. Not sure what kind of support we will get once HKS USA goes away, but we should be able to get parts from Japan if necessary.
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 2007 350Z NISMO #0618: Zerolift | UPREV | F.I. | Greddy | Competition Clutch | Injector Dynamics | Aeromotive | Pioneer | JL
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