This is one of the myths. Weight increases the ability to break tires loose because it offers more resistance to getting the car rolling

Funny you should mention having bought WRX instead of the Z car. because the WRX and STI are my answer. I owned an e39 v8 at the time and was shopping for something new, wanted to buy turbo if possible and tested the Subarus. Completely unimpressed, ended up buying an e90 335I instead.