if you read the complete article and look at the hp and tq, numbers and figure in that the elbow is worth 9 hp and 5 ft.lbs. that means the p-51 made 16.9 more hp than a stock int and elbow @ 6250 rpm and 20.7 hp @6750 rpm.in the test car from anderson ,rick shifts that engine around 7000 rpm and only falls to 5500 or so on the shift,which means it made an avrage of 16.75 more hp than a stock int and elbow ,if thats what you have to compare it to, in that rpm range. the power that it made will make that car go about 2 tenths faster if you keep it in the 5500-7000 rpm range as it was intended to run on this test .thats a better gain than a 302 manifold ever made on stock ported heads .if you dont want to turn that much rpm fox lake can make a cam that will make power in lower rpm range to fit your needs[custom cams].and i think the p-51 looks a whole lot better than the plasic piece with a sewer elbow stuck on top.as for the price ,this is a way harder piece to make and does come with fuel rails and all hardware un like the bullit which costs 200.00 more only makes 5 hp and takes 2 days to install