I would :
1. Get rid of that hideous exhaust
2. Measure diff temps and add ducting if needed
3. Measure rear brake temps and see if cooling is even needed
I wouldn't think the rear brakes get too hot unless using slicks or running long sessions.
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-'11 Gun Metallic Nismo 370z
-'12 WRB STi hatch
-'99 2.5RS coupe
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