What are the recommended performance upgrades for a Nissan 370Z?

I just bought a Nissan 370Z and I'm looking to increase its performance. What upgrades do you recommend? I'm not looking for anything too extreme, just some minor improvements.

One easy and affordable upgrade would be to install a cold air intake system. This will improve the air flow to your engine, resulting in a small increase in horsepower and torque.

Another option would be to upgrade the exhaust system. This can improve horsepower and also give your car a deeper, more aggressive sound.