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Originally Posted by Irace86.2.0
The OEM transmission is not the strongest, but it is good enough. Many people are running double the power and torque. I'm running a bar of boost on E85. I have some gear grind, but I think this was more from the previous owner maybe missing 5th often than the transmission being faulty. The S2000 transmission is slightly better. I don't know if the choice to use the factory transmission is because it fit better, or they will be able to sell more parts, or they found that it reduces the costs for consumers.
I'm curious about their high horsepower transmission option. I don't know if they will use the CD009. If so then it will probably take some tunnel modifications if the engine sits against the firewall. The CD009 just barely fits with the FA20 with minor clearance issues.
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I am not overly concerned with the OE transmission. I just see it as a potential weak link. I did recently score a spare for my car.
K Power does already make adaptor kits to use the BMW 5 and 6 speed with the K series. It is a bit on the heavy side but no worse then the CD009. Plus they are tough and cheap. I don't know how tough it would be to fit in the transmission tunnel.