Mate I'm running a Blitz nur specR cat back, 3"cat, blitz front pipe and tomei bellmouth dumps.
Sounds like an absolute animal, especially after i fitted tomei poncams.
But steer clear of this if you are after somethig quiet! Although from just catback it should be fairly sedate.
Still on the loud side compared to say Trust PEII or HKS Silent High Power.
Stay clear of X-force I reckon, cheap, but doesn't fit up too well and sounds a bit on the homo side.
Just my opinion.