Looking for some thoughts on my persistently negative fuel trims (-12 idle, -7 cruise). I did the intake, UICP and FMIC installs myself and had the TBE done at Mitsu dealer. Any ideas on why it keeps creeping so negative? My first thought is an air leak somewhere in the intake system after the MAF sensor, but haven't found one. Is this somewhat expected when using an OTS map that is intended for a slightly different intake? The Cobb SF is the map most people seem to be using with the ETS intake as they're most similar. Also, not sure if this might be related but I've had some boost spikes up to 28psi on this tune and am switching to the LWG map to address this until my 3-port and custom E-tune. Any ideas would be most appreciated. Thanks.