Looks like it's defo pointing towards Magnex then, except they no longer exist as such, and not sure if Mongoose kept the gtt exhaust range going? I guess the odd 2nd hand one will crop up every now & then though...maybe
Trev, is it noticeably louder than o.e even with the centre box in situ?
Not so much worried about the additional centre box harming performance as I'm only running o.e power anyway.
Leigh, did you get chance to have a look at the availability of the Timax units? Appreciate you putting yourself out like that