my bro just upgraded to a SS2 hypergear and used to have a 2876 with 0.64 HKS rear, although most will say its a shit turbo, it went pretty hard from my experience, he ran it on 12psi and was
doing consistent flat 13sec quarters with a HKS hi power silent exhaust, id estimate 230kw, started pulling at 3500rpm and got a bit crazy 6000-7000rpm, not
great I know, but it was fun.
It went harder than my 2871 hiflow in stock housings, suprising but was surging like crazy and eventually started smoking which led to the upgrade to SS2, with an antisurge
comp housing I wondered wether it could of lasted longer but in comparison to a stock turbo I think it was a decent turbo but not ideal, just my observation.