Take your pick of brands, but non run flat tires, a tune, and downpipes would be a great starting point. It will totally transform how the car drives. Beyond that, decide what you'd like to accomplish with the mods and go from there.
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'09 AW 135i 6MT - JB4 + E85 + meth - Sold
'12 Black Diamond CTS-V Sedan - Stock for now
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