I got my car with a KLZE but the ASpec ECU. At first I tried the probinator chip but the shop that soldered it on butchered it and destroyed my ECU. So I ordered the Xtremethings unit. The guy who sells it, Mike, is very friendly and VERY knowledgeable about the KL motor. The ECU came and worked very well. The car had noticeably more power, but also used more gas. It went on like this for a few months, but as time went on it was using more and more gas and had more and more trouble starting. A few months ago, the car became very sluggish when first moving off after I started it, and I realized there was an ECU problem. I got a KLZE ECU and all of my problems, including starting, are gone. I will call Michael and see if this is a common issue with his ECU, which I liked a lot at first. Not knowing if it was a problem with just my ECU or his ECUs in general, I don't want to say that it was good or bad, just that these were my experiences with it. I will update after I talk to him sometime this week.