I recently purchased JB4 for my R. I installed it yesterday and put about 30 miles on with map 1 and couldn’t really tell much of a difference. Switched it to map 2 and it’s a little better but doesn’t seem to have that in your face boost that my past turned card have had. Could it be because I haven’t done any WOT runs and it’s not adapted? Any other thoughts? May just ditch it and get UM. ?*