APS Turbo back here along with APS 65 mil. intake.
Tremendous overall improvement. Boost increased to 15.5psi, I have EGT, A/F and BOOST gauges. I forgot to reset ECu and car backfired (or afterfired) constantly for a couple of days after installation but eventually went away. The gauges now register normal activity after 2 days. I am estimating @ least 20 hp increase on ButtDyno!
It has been about a month now and no CE lights from Exhaust nor from intake. No droning, a little loud @ WOT since this turbo-back was actually designed for the 2 litre WRX, never got this loud on the WRX.