MX-3.com

Turbo'd KL vs Supercharged KL are about 100:1. You're talking like a turbo'd KL is an issue. They're tried-tested-and-true setups where you can actually buy all the parts for a total bolt-in kit, while Supercharged KL aren't common and those doing it mostly all need to do custom fabrication work.

Here's a nice site for ya:
http://www.mazdamaniac.com/oldsite/home1.htm" onclick="window.open(this.href);return false;

He originally went supercharged but actually went to a turbo later on.