For the Borla mufflers that I want to swap in for my flows. I simply just don't like the drone. On Borla's site they have like 6 different models or more to choose from. I was thinking of stepping up to something louder than a flow but without the drone. I was hoping i could achieve that with a Borla muffler. I was thinking in order to make it louder than a flow I would have to look at one of the XR-1 racing models available. From the XR-1 models, there are XR-1 Sportsman Racing Mufflers XR-1 Multi-core Racing mufflers THEN, they have universal mufflers to choose from. I'm guessing they aren't as loud as the xr-1 racing exhuast. Universal S-type mufflers Universal Turbo mufflers Universal Turbo XL mufflers Do any of you know or think that any of these models will be able to give me a sound that is louder than my flowmasters, but without that intense drone? Thanks a bunch!!