Had mine mounted in the base of the up-pipe right above the flange. It's an Omori gauge/sensor and should be pretty accurate. It's as much for 'fun' factor as anything else. If you're running fuel rails, and I'm assuming you are, leaning out a particular cylinder shouldn't be an issue. I'm using the MRT setup with pink STi injectors. Pretty confident this won't lean out at my current boost/power levels.

Oh yeah, when you're running so much fuel and air through the motor that you get real blow-by and real exhaust ignition, that sure as hell ain't "Fast and Furious", that's just fast. Now if you're running one of those farging flamethrower tips, that's Fast and Furious.

Check the new Sport Compact Car for further details.