Muffler suggestions

[Totalled]

Yes, the x-pipe does mellow and quiet the exhaust down. This is my 73 F350 with a 4v 390 towing with headers and true 2.5" duals, then on the dyno with an x-pipe installed, everything else the same. The x-pipe made a massive difference driving it around in the sound level.

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[Tubo]

My 5.0 powered 73 Vert has a drone , with both Flow 40's(too harsh fer me) and with Dynomax'es, though the Dynom's are a smaller RPM range. Don65Stang is completely correct about the harmonics causing "drone".

Look up Quarter Wave Attenuators, apparrently bout the only way to completely stop "drone"

I'm working on a set now.

 

[Mahogaraunch]

I've got the 40's on mine and they sound fantastic. It used to have the stock set up and reminded me of a "put put" car before. Sounds tight 'n right now. No complaints at all. Its got that nice deep rumble without being obnoxious.

 

[droptop73]

I've run Flowmasters, generic Turbo style and now an OE replacement for our cars. The Flowmasters were on a whopping 30 minutes before deciding no thank you. The Turbos were much better but still too much for a convertible. The OE mufflers are mellow and quiet driving around town and on the highway but still sound good when on the throttle.

In a convertible you hear way more noise, both from external and internal sources.