Hey guys. So i just got a gf8 an found that there was a boost leak from the pipe at bottom of intercooler to turbo and wouldnt boost above 8 psi. I sorted that .. and with the boost tap set up inline with factory solenoid (taps also turned right down to lowest setting) it jumped right up to 15psi with heaps of popping and backfiring . So i removed the factory solenoid from equation and its dropped back to 11-12 psi.. but is stil popping n backfiring. Seems to me like ecu is cutting ignition and causing detonating . Any ideas what could cause this? As i thought 11 psi was far too low for any detonation issues to occur. Thanks in advance guys. Any helps much appreciated as it drivn me crazy lol