There are a range of upgrades available for your braking system, ranging from a simple brake pad change all the way up to a full big brake kit.
If your chasing speed or just like driving your car fast then your going to want to be able to stop just as fast, The RX-8 has some very good brakes as standard but like the RX-7 that come before it there is still plenty of room for improvement
Some options are listed below.

