My track car has a full interior, a/c and power steering. Obviously I could eek a little more performance by stripping all of that stuff out, but the car performs very well as it is, and I still like to drive the car on the streets every now and then on nice days so I don't see the point in making it so uncomfortable that I never drive it. I mean, it's obviously not the most comfortable with the roll cage, racing seats, harnesses, lumpy idle, very stiff suspension at every point, multiplate clutch and loud as hell....but I don't see a reason to make it completely miserable when it already performs to a higher standard then I will ever really need. I prefer to have my cake and eat it too. I like the fact that I can drive it around and it still looks like a complete car instead of stripped down, gutted shell with an engine in vague reminiscence of what used to be an entire car.