I want my car to be a bit louder, but I am not sure about whether or not I want to go to a full off-road pipe. I was wondering, is there any benefit (performance wise) to high flow cats, like the bassanni X? Is there much of a gain if you have no cats vs. high flow cats? And are high flow cats louder than stock? Almost as loud as no cats? Lastly, has anyone had warranty work on their cars with an off-road or high flow midpipe? Did the dealer care?