Ugh, I hate flowmasters. Every time I hear that metallic ringing sound it makes me want to check the valve adjustment.
That said, twayne's car might be the best sounding flowmaster equipped car I've ever heard. If it has the ol' flowmaster drone at speed though they'd have to go.
I run Dynomax welded Ultra-flo's on my cars. I used to run glass paks (banjo's playing) but got sick of the drone those have as well.