Buying off the shelf stuff will only get you about 90% of the way there to a full prep SP car...
Order of importance:
1) Instruction
2) Seat Time
3) Better Instruction
4) Seat Time
5) Seat Time
6) A6's or R1S-if you have a codriver and live in the desert
7) Real Diff
8) Suspension
9) Power
10) Weight
11) Aero
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