Just had this fitted to my car today as I was becoming bored by the stock exhaust and all the quiet Supra comments (you know who you are)
All I can say is WOW! Not too loud to become annoying or obtrusive whilst driving, but makes a lovely deep growl when turning the car on and whilst moving. Also, so far (I believe) I am the only person to have the single box version fitted to my car.
If anyone is thinking of upgrading their exhaust from stock, or wants to quieten down their existing exhaust, then by all means this is the way to go.
I was smiling all the way home ...stopped smiling in traffic , then carried on when it was clear .