Has anyone had any experience with this air/fuel ratio device? The reason I ask is, my friend bought one for his focus and realized it is for japanese cars. It has the p10/11 chassis code right on the box, so I figured one of you guys might have used one and can give me some info on it. He wants to sell it to me for $150, so I need to know if it work's good on sr20's and if it's worth his asking price. Oh yeah, it's still brand new in the box with instructions. Any info would be greatly appreciated and thanks in advance.