Brakes/Pads
Introduction
Having a more powerful engine and going faster will at some point need to be balanced by better brakes. All the kinetic energy that is in your car is dissipated into your brakes as heat when you stop, even at speeds your car will reach without engine tuning the stock brakes might not be up to the job. Especially if you plan to use your car on the track the stock brakes will soon overheat and lose their stopping power and they will even get damaged. The first step to improving your brakes is by simply replacing your brake pads by better ones. Performance brake pads will provide better stopping power and will continue to work at higher temperatures where normal pads would start losing their grip on the brake disc. They will also, usually, last longer than normal brake pads.

Mintex high performance brake pads.
What should I be looking for?
That depends on what you want, there are brake pads that will give you a lot more braking power on the track, when the brakes are warmed up, but not on the street where the brakes will always be a lot colder. Furthermore, the materials used in these pads can be aggresive and damage the paint or coating on your rims. "Street" type braking pads are usually better for your rims, don't have the disadvantage of not working at normal temperatures, and usually have a longer life span than stock pads.

The EBC Greenstuff is slightly better than stock pads and makes cleaning your rims a lot easier, it doesn't match other aftermarket pads in performance.
What if different pads aren't enough?
If you have upgraded your pads and still find your car not braking hard enough or braking power fading away after braking hard several times you will have to upgrade your
braking discs too. Like pads, these come in different ranges and materials, some being more suitable for track use and others for road use.

A full performance braking system including pads, discs, calipers, and brake lines.
A note to buying "better" brakes
The racing type brake pads ands discs are designed to work at very high temperatures, this is what makes them suitable for use on racing cars. The downside of this however is that they won't do much, if anything at all, at low temperatures. If you install this type of brakes you should always warm them up when you drive off by "dragging" your brakes a while when you start driving. Needless to say that this is pretty inconvenient, and chances are you'll forget it on a day when you're in a hurry and won't be able to stop your car when you really have to.