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Gti-r cams are different and designed for a solid lifter, but can be used as an upgrade to a highport or lowport. Not that great of an upgrade though. Back in 1995 it might have been a decent idea.
From what I remember, they were a questionable upgrade back then. Mosty a lumpy idle. I think Nissan Motorsports sold them as an upgrade back then, and maybe Stillen, too.
Edit: found the link
CAMS