Better pads, or if you are really serious and have the budget, go with the Brembro bigger brakes kit. Depending on how your car is setup now, you may need bigger wheels to accomodate the bigger calipers.Brembo Big Brake Kits, E36 M3
Brake cooling is important, but usually not needed on street cars. It is more likely that you will get a larger increase in stopping power and heat dissipation through proper pads. Brake duct cooling is a better option for track cars where the pads are under constant abuse for extensive periods.
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