And realistically you could probably get another 1k red line with a completely perfect drive train. But even that would probably get you close to 200. Or if you switched out your final drive gear from a .57 to a .50 like the challenger has that is a 14% increase in speed to your RPM's (If I did the math right, I am tired) It all comes down to having the torque to hit the same top end rpms in 6th. And I am a firm believer that the SS has the high end torque to do it. The engine seems to have a lot left in reserve in the 150 range. That is my opinion anyway.