thanks for all the feedback.
i got pfc before exhaust coz i was running very rich and getting bad fuel economy, was worried i might have a problem but tune fixed everything ; also once i get exhaust etc its a hourly rate for dyno tune, so no $500 fee everytime i want a tune
i didnt get a dyno run before pfc install, only before pfc tune amd i went from 138rwkw to 153rwkw and from 210Nm min 420Nm max torque to 302 Nm min 435Nm max.