So, i did the doide mod, have boost set to 14psi on one and 17 psi on another setting. I sometimes throw a check engine light no matter what boost setting. I have a stock FPR on my 01 black
a4. The only code it throws is a P0171, witch is: system to lean bank 1. That is the last cylinder on the fuel rail. I'm wondering if it would be a good idea to upgrade the FPR so the system doesn't go lean, unless you guys think its a lazy injector or somethings else. My MASS AIR sensor is clean as a whistle too. What is the stock FPR on this car anyways?