Once again guys, cheers for the input.
I have been to see Saj at Jap Performance this afternoon and parted with more pennies for the above pictured exhaust and a Cusco 3" open neck decat downpipe.
James. That's one hell of a spot!

It narrows to just over two and three quarter inches at the end. You weren't wrong when you said you know exhaust pipes.
Rob, It's going to be all about little bits until the balance is right. I always knew I would have to go 3" de-cat, but was meant to be saving that for next year. I reckon it will have to go induction next (again this year I expect) and from there who knows. The front mount is beginning to look appealing all of a sudden too. But that WILL be next year.
Martyn, cheers for all your help mate, as always, much appreciated.