Rich, I have the same one on my 605 and am very happy with it. I was told that a couple spacers might have given me a bit more hp but I never tested any. I didn't have room under the hood for any additional height. I machined the top to match the Thermoquads. I believe once you try yours and get the carbs dialed in nobody will ever be able to pry it out of your hands. Mine is very street friendly and makes insane torque from idle to redline.