Join Date: Feb 2012
Other Toys: 2006 Mini Cooper, 1981 Yamaha RD250LC, 1996 Suzuki Bandit 600, Motobecane AV92 (being restored).
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I cannot really help you on the supercharger thing (I have a 320), but if it is doing 0-60 in about 7.5 seconds it must be working.
My car also has P7s, and does tramline a bit. My wheels are 16 inch. I know that 17 inch tramlines more. Which size do you have?
Other things that can make it twitchy are uneven tyre pressures and the steering damper.
There is also quite a bit of roadnoise. However, you dont notice it with the roof down. :-)