actually they are ,TK MODIFIED 965-S GRIND CAMSHAFTS -- better street & EFI use, more torque than 964 or SC .
strong bottom end - better than stock off boost, no stall , no sputter , no flat spots
I have a RUF K-29 turbo and it still has the same boost threshold as a K-27.
it does hit very hard but my wife can drive it to get groceries.
Still CIS with a RarlyL8 adjustable WUR, modded Fuel head, headers and muffler.
I've posted these before need to make new ones , the sound gets so many complements.
https://www.youtube.com/watch?v=URADTyXSo5I
https://www.youtube.com/watch?v=DhrHoGAKG2M