I had one of these in my old R33, if you set the gain too high and you for some reason get wheel spin (happen to me on the highway in the rain) the boost will spike. I had it set on about 1.3 Bar and it spike to 1.8 bar when the gain was on 45 (was testing). Anything above 25 in my old car cause a fairly larger spike ie, 0.2 bar or more in cetain conditions.