actually i only put the fmu you on the car for about 100miles and with out it i can't get the correct upper end fuel for boost seeing that i don't have any electornics i let the motor break in for the first 500miles with little (2-3lbs) boost at most because i had just put in my new ACT stage 4/5 Clutch and needed to break it in as well, which means it was babied for 500 miles before even being boosted upon, also the fmu only adds extra fuel when boost is present not all the time, so under little to no boost even if it was on there it would produce that much fuel, as for the injectors they still produce the same as factory but they have the capability to produce more...so "washing" out the pistons wasn't the case i think they were just improperly gapped in the first place :o