Ran a F56 Cooper S with a jcw tune and exhaust today. Started on interstate and then went into city traffic, sealevel 100f extreme humidity.

Interstate pulls in 5th and 6th gear there was a huge power difference between racechip and jcw ,with the racechip car pulling ahead with very noticeable hp advantage.Jcw tune driver exits behind me and pulls alongside with passenger window down motioning me to do the same. driver asked what I had done to my car, my reply was it stock except for the Jcw suspension and the bbs wheels.

Next light we are in front and side by side.when the light turned green jcw driver cut a great tree but I was on my game. End result was the same as the interstate with the racechip showing a power advantage gaining a car length to a car and a half advantage with each upshift.