159 2.4D Exhaust Upgrade & Map - What, Where and Who?

[Flaming Hedgehog]

Hi All,
Seeking advice from the brains trust on what can be done to give the 2.4D a bit more vroom.
Not wanting to go bonkers on it, just open up the hidden potential that is apparently lurking in there somewhere.
My Sportwagon has the single outlet exhaust that I wish to make dual purely for aesthetics but while we're at it what else?
Apparently the 2.4D responds well to a remap. Anyone done this?
Some 'who to see about this' in Adl or Mel recommendations would be mucho appreciated.

Cheers,
Michael

[As the day goes]

Speak to Antonio in Thomastown. He might be of assistance