For ages, my Mazdaspeed Protege and I have been putting up with violent fuel cut issues at about 4200 rpm under hard accelleration (at lower rpms in cool/cold weather). Turns out I was getting crazy boost spikes due to a failing WGA - which would trigger the car to cut fuel in order to protect itself. Now the car runs as good or better than it ever has - I can rocket up to redline without fear ! This WGA was less than half the price Mazda wanted for theirs - and the one that came out of my car looked like a cheap piece of junk. The Forge is a beautiful piece of quality engineering ! (but get a pro to install it)