I test my engine last weekend. And yes, low end of the engine is very good but it has lack of high end. I test it with a nova 2630 pipe and long manifold. Then due to the weather conditions, I can not find any change to try a short manifold. I install one tooth bigger second gear pinion, but it is still a bit slow on the back strait compared the novas. But it is very reliable and easy tune engine. And considering the price level, I'm happy with it.