For brakes: even if you don't track, SS brake likes would add a better responsive feel even in everyday driving. When you install lines, you will need to flush the brake fluid, so replace it with proper DOT 4 or DOT 5 fluid while you're at it. Replace the brake pads with better ones after your current pads wear out to save some money.
For sound: resonated test pipes or HFC's are cheaper than full systems by a lot
Oil cooler: Nissan will be introducing better oil coolers for the 2012 model, so just wait for that product to come out n buy it
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| EVO X MR | '11 WRX STI | 370Z SPRT | 911 (991) C2S |
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