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Message: [QUOTE="redwhitenblue, post: 1182213, member: 17875"] There are no generations of 6466, they are all the same (and only available air cooled bb), and use the 66 turbine wheel. It is a great performer, and spools dead nuts identical to the 6266bb but makes about 100whp more on the dyno all in. There have been less than a few instances where I've ever had a 6766 outperform a 6466 (usually only on a car with big lungs heads/cam). The 66 turbine wheel drops back pressure so much over the 65mm turbine wheel that we often have to add another gate to keep boost under control. Interestingly with the .81 turbine housing we have made more power than the .96 with of course quicker spool. [/QUOTE]

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