There is one member that is planning on doing a 400+HP turbo build but he's been ejected from the forum. Most of the work you'd be doing at this point would be custom and the only turbos I've seen available for the crz have been cheap dodgy eBay turbos. I am a stickler when it comes to turbo quality and eBay turbos are lowest on my list of turbos to throw on a car. They are usually of cheap quality and don't handle much boost before the internals grenade to pieces.