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Doug!
Yes, NUT Behind the wheel is best/bang for the buck to improve performance of a vehicle! Hands DOWN!
After that, WEIGHT is the CHEAPEST WAY to improve performance provided, that you are taking off stuff you don't need. In a production based race car that means, interior, radio, a/c, power windows, replace glass with lexan etc. Any of which make the car uncomfortable for the stree.
Porsche offer "Ceramic Brakes", Carbon rotors are used on Race Cars (like F1). Carbon is SUPER expensive. Cerramic does offer weight savings. My "gut tells me to upgrade to Ceramic which does offer maybe 40lbs of unsprung and rotational weight saving would be $10,000.
I do know weight of power E36 Seats to be in the 65 lbs range. Let's just say the M5 seats are 80lbs each. Unforunately, I've heard the the tilt wheel won't work if you mess with the seats. I guess the memory function thing gets all messed up.
As you can see from my sig I do own a race car. I'm fortunate to keep it with a shop that maintains and transports it for me. That car is much more fun to drive than the //M5.
Jeff
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2001 E39 M5 Titanium Silver/Silverstone
1997 BMW M3 Gruppe N Race Car
2005 X5 4.4i
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