What is a BILLET ENGINE, and when should you get one? vs cast 2JZ: Bullet Race Engineering Tour.

Following on from our "Frankenstein 2J RB" a few weeks ago, we flew to Adelaide to speak to Darren from Bullet Race Engineering about what makes a billet engine better, and at what point you might consider one over a standard cast iron block.
While we were there we got a factory tour and watched some billet 4G63's being milled up.
Huge thanks to Bullet for taking the time to show us around!