I'm ready for some new mufflers and want to go back to Flowmasters. Back in the day all we had was 40 series two chambers but now I see they added super 40 and super 44 as well. I'm looking mufflers that sound just like the original 40 series but with maybe less of the dreaded drone at 2000-2500 rpm. What's the difference between these mufflers and can any of them help with the drone while keeping that original "flowmaster sound"? Thanks.