2006 TBSS, TVS1900 with mail order tune. 12615136 Map and the tune does have 2 bar OS. I just got it running today and it?s pretty lazy. Using the scanner I noticed that KOEO map reads 15psi and 104kpa which maxes out the gauge. When I start and idle, the map reads 11.5 psi. Any ideas? Could the offset be off?