Yeah, I like the way they sound but, I like the fact that they are designed for low compression engines and increase cylinder pressure. 491 hp and 578 ft-lbs of torque in a basically stock engine is fairly impressive. It's going to be used in my 77 D100 swb. It's a cruiser and parts chaser. Might make a pass or two at my local dragstrip but, it will mostly be a driver.