Cheers Fudd ! Spoke to a workmate who suggested perhaps just a free-flowing muffler could do the trick ! Will speak to at least 3 exhaust pros now about what can be achieved.
Here's a funny one for ya . . .
I emailed Glenroy Exhausts and asked whether they done any work on an 86/BRZ and their reply was . . . "what's an 86/BRZ?" . . . and I replied . . . "obviously not" !!!