HV oil pump required for cartech's street sleepr kit??

My brother's installing a cartech street sleeper t64 kit into his 91 gt that he picked up a while back and was told by someone that he'll first have to install a different oil pump in order to run the kit.. I think this is bs personally, I don't see how turbo seals and such will suffer with a stock oil pump but wanted to post here and get the right answer before assuming this guy's a tool and continuing with the install without the swap.

Thanks and appreciate any help you guys can provide


Ryan