I got a duplex system from JD at Motormech for my 16VT, and then swapped it over to the 20VT I loved it so much! Princely sum of £350 for a custom built 2.5" Catback.
Is that a standard bumper with the other corner cut out? - Did Motortech do that too? - How does it sound compared to blue flame? - I assume it has resonators somewhere?
Apologies for not getting back to you on this, I rarely check the Forum these days.
It is indeed a standard bumper, Motormech did the original on the 16VT then Joe at FCSS swapped it over onto my 20VT. Just took a template of the original cut in the bumper, flipped it and cut it out of the other side. Tidy job and means from the side (either side) it looks standard.
It sounds lovely, it's got a bassy rumble to it and a lovely burble on tick over. It's VERY loud when you want it to be, but quiet enough at low revs to not wake the whole town.
I can get a video if you want?