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Read the rule book and or post your mods up here. F stock = stock car with the exception of a few things. Catbacks are allowed, front sways, struts, alignment, wheels with same size (diameter AND width) as stock, and wear items (brake pads, tires, fluids). I might be missing a few things there. ESP allows more mods to the suspension and engine but I'm not quite sure what the exact rules are. Street mod is pretty much all out.
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