Much of what you ask is dependent on what you are willing to spend.
How often will you be taking your car?
How much track stuff/spares will you carry?
what is the weather like where you go?
Alluminum is much lighter than steel. Weight = fuel economy
Steel is lower cost
Checkout Rennlist, there are some good sub-forums for what you are asking
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2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY
2004 996 Targa Tip
Instructor - San Diego region
2014 Porsche Performance Driving School
2020 BMW X3, 2013 Ram 1500, 2016 Cmax, 2004 F-150 "Big Red"
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