I'd recommend going with the sport 500's over OEM CHRA if you want 'reliable'. With the Sport 500's you won't have to tax the turbos to reach your power goal. I made 380 @14psi and 427 @ 18. I have the sneaking suspicion that my turbos are slowly on their way out. Debating if 530bb or another set of Sport 500s are going in next.