First: in Japan you can run an aftermarket turbo and still be legal.
Second: I have 256 cams in my stockish sr and their awesome. My friend also has them in his gt28rs 400hpish sr and he loves them.
Third: don't mix intake/exhaust cams on turbo motors/sr's. Generally speaking, they do not respond well. Sooo, if you plan on running a 264 exhaust cam, run a 264 intake cam.
Just my thoughts/opinions.
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