My exhaust temp was above the O2 sensor under heavy load so I decided to buy this cooler. The product has a hole in the side of the cylinder that leads to the exhaust. When installing, this hole must face the outlet. There is a mark on the "mother” for this. The problem is this: what to do if the index mark is misaligned after installation? No spacers are provided to achieve proper alignment. A thick brass washer is included. Forget metric washers at your local hardware store. I ordered airplane copper washers from a website that recommended them for 18mm spark plugs on vintage Harley bikes. Replacing the existing washer with a single crush washer helped. The product acts as a heatsink and I have not noticed any effect on AFR readings with or without the heatsink installed. If there weren't any installation issues I would have put it higher.
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