Flowmaster makes all types of mufflers for a given engine.
clicky link If you want noise go with one of their hi-performance straight through or single or two chamber noise makers. Flowmaster has them.
If you want OEM quiet go with one of Flowmasters 3 chamber systems.
I used the three chamber 70 series on a 5.7 2500 chevy 4.10 gears for a nice quiet OEM sound....no drone in the cab. I wasn't after any better mpg but it did help smooth out a bit of rough idle and helped lower engine temps while towing (same loads on the same roads).
Magnaflow also has different type mufflers depending how much noise you want ..... or don't want.
Don't depend on a mechanic or pick the guy next doors story about mufflers.
Go to the source which is the muffler mfg and ask them what muffler you need for noise or quiet.