A few ideas for openable windows.

 

Last Saturday the engine was put on the dyno. It recorded a best of 557.7 hp at 6000 RPM and 527.7 lb ft of torque at 4500 rpm. This was through the stock cast 2.5 inch outlet exhaust manifolds and the stock catalytic converters. Jeff says headers and free flowing 3" exhaust could add another 45 hp.