Is there a COS that only does 1 bar SD? Everything that I can see in the tutorials and online references 2-3 bar. This is for an '02 LS1/A4 car. I tried using the stock OS and failed the MAF, however there have been weird side effects like short shifting the trans a couple hundred rpm at WOT. Figured a COS would correct that, or if there is a better option I am for it.