I currently have apr stage 1+ test pipe flash on my 03 b6 a4, and was looking on there website and they have a stage 2+ flash, what is the difference between the stage 1+ and 2+? what are the wheel horse power gains? I was reading on another post and someone said that the only difference was the stage 2+ disabled any cat related check engine lights. surely this info cant be correct because they want to charge 150 for the upgrade?!?!
some one with some knowledge please speak your mind.