I have it on my DD Accord. My exhaust is 4-1 Header + Metallic Cat + piping + Twin loop muffler, all piping is 2.5".
It sounds alright. Lil deep and rumble until you step on it and it's very throaty.
I'm used to the deep sounds from my G35, so my opinion is a lil bias toward it. But some others heard my Accord and they said they like it.