flowmaster 40 which type

I HAD a set of Flowmaster 50`s (offset in and centered out) which I ended up selling to my UPS guy. Unless you like headaches I would avoid those droning mufflers. To boot ,the 50`s are supposed to be the quieter of the 40 and 50 series. In defense of my ex mufflers they sound great on my UPS guys 8.5-1 cr 350 Chevy but were just horrible on my 11-1 cr 440. I think Flowmasters are a very well marketed muffler but as mentioned earlier, there are better mufflers to be had for the same money. I`d shop around some before going with Flowmasters.