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It was one if the first things I did to my car. A lot of Cayman guys have the Mantis. Check out Planet nine. It was one of the first available. Apparently it was tested and gave 7-8 rwhp.
Mine was solid, black anodized. Looked very high quality; it's solid and heavy. The BBI is light and spoked. I am unsure of the relative polar moment of inertia. If it is significant then the bbi would give you more of a light flywheel effect where as the Mantis more flywheel momentum smoothness. I doubt this effect would be noticeable
At the time I did notice a feeling of more power. I desnorked at the same time so I might have been up 10 hp
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