The reason I ask is have you maxxed out what you have? Is it running at the track? What did it run? A bigger cam might make more power, but lose it where you use it (torque). The torque curve of the XE274 is flatter and starts almost off idle. The 292H will be peakier, so less right off idle, more once you're rolling. If the gearing and convertor are stock or close the car will feel slower. I wasn't sure if you are bored with it, have an issue, or got a slower ET than you thought.