OK OK it was me
As I already have a modified 3" system fitted a change of backbox doesn't count as a mod... it's simply a change
There I've said it
But I've looked and there aren't many 3" entry backboxes out there. I don't think the H&S is a true 3" BB they just taper a japstyle up to 3"... nur spec is an option but I thought i'd try something else, done Prodrive, STI, H&S japstyle, NurSpec, Milltek, ... what's left...?