uh it's impossible to tell you in words how noticeable it is
I can say that I love the stock handling balance with stock power
I have 245/265 on my RAC RG63 18" with stock motor
So in steady state cornering the car will likely understeer more, even moreso because the supercharger adds weight up front. But since you will have a supercharger, you can easily turn understeer into oversteer by pressing your right foot harder in lower speed corners with DSC off. Just make sure you know what you're doing.
