Done all of the above.

Three inch straight back from the cats no muffler. WAYYY too loud even for me. Tried four different mufflers ended up with a 3" straight through with
2 x 2 tips Very crisp up around 4K and above a little boomy down low but acceptable. Was done purely for power and matched to a custom PowerChip
ECU (I know the CEO) to run on 100 Octane.

I am VERY finicky (is that a word in the US) and the result is perfect for my ears with a bonus of around 8-10 HP, sounds nothing like a Civic.

SRT same motor essentially same sound if you play but you wont hear the blower.