depends on your turbo and what kind of power band you are looking for.
The 256 cam is really IMO meant for upgrading a stock SR, or an SR or motor that is required by a sanctioning body (like in JAPAN) to run a stock turbo.
The 264 HKS cams are beautiful and are IMO the best camshafts of any size for any SR car pushing 350-450 target raneg outputs etc .
Streetable but aggressive, I have dyno'd several cars equipt with this cam and they are always the big winners, not just in peak power but mid range torque and length of power band (useable) as well
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