Originally Posted by Phlonx
I only have the VRSF downpipes, the rest is stock. No DP Fix, you are not supposed to use DP fix with JB4 because it has it built in to the software.
Not true, the JB4 just auto-clears any codes that come up. BMS does sell an O2 simulator that you can use to fool the ecu (and any OBDII tests) into thinking everything is ok and you can use it with the JB4.