Any greater lift cam than 264 will "confuse" the constant injection system (CIS) resulting in a very erratic low speed performance. Check the Top End Performance web site for a better explanation on cams and CIS. This really isn't bad. 264 will give great all around power with excellent torque. Spend money on a great exhaust system with a K&N air filter (make sure you have a cold air intake) and enjoy. Otherwise power gains can only come from higher compression pistons and porting the head and intake manifold. With CIS more air automatically means more gas. Also check the Korman web site for info - highly recomended. Have fun!