Massive 4-inch Mufflex Exhaust Sounds Wicked On A 402 CI Firehawk

Last week I posted the Kooks True Dual system for the 4th Gen. F-bodies and now I’m exploring the exact opposite, a Y-pipe into a 4-inch single muffler.

The 4-inch Mufflex combo sounds nasty and raspy on this Firehawk. Anyone running a 4-inch single system? If so, what do you think?
For everyone else, do you prefer true duals or a Y-pipe into a single system?