Tuning options for the V6 arent commercially abundant. There are hardly any exhaust/filters and piddly crap for it. So when it comes to tuning for cams, headwork, ECU corrections your basically on your own to decide what you want.
Not enough V6s out there to make any venture really worthwhile.
Saying that, if you can get hold of the cliotrophy cams, valve springs, convert to the twin plenham setup on the MK1, exhaust you can see 285bhp easy. THe engine is in a very poor state of tune.......loads more to come out.