[HummerRidin26"kmc's]

headers, high flow cats, an magnaflow exhaust is what my truck has an its super loud yet very clean sounding. I had flow masters before on it an like you ive "always" been a flow master fan but the magnaflows in my opnion where much much better sounding cleaner an louder it roars and the truck response was better with magnaflow. i have 110% converted from flowmasters to magnaflows. If your looking for some grrr that sounds like a 500 hp engine thats your set up. Iam not sure what the power diffrences are really all i can tell you is the magnaflows helped my low end response an mid range more than the flowmaster did which might pick u up an extra mpg as it did for me. less throttle more movement.