Hi, so the 8V Mk 2 has a single silencer and that is the back box. The 16V has a centre box in addition to the back box. I believe that the 8V centre section will fit a 16V and thus remove that centre silencer.
You can do this without lifting the car fully. I've changed two 8V exhausts, I would recommend getting the full system, you may find it difficult to get the rear box off the centre pipe du to the pipes bonding themselves to each other. I got this one for mine:
http://www.ebay.co.uk/itm/Fiat-Punt...Replacement-/120993849076?hash=item1c2bcb9ef4
You will need one of these as well
http://www.ebay.co.uk/itm/Fiat-Punt...Replacement-/121213818052?hash=item1c38e814c4
Oh, to get the back box fitted you will need to jack the passenger side rear wheel up so that there is enough clearance between the floor and the axle.
I did mine the last time using ramps to start with and then jacking the rear passeneger side up off the ramp, if that makes sense.
Make sure you've bought some exhaust jointing paste before starting as well!
So....
Start at the front, drive the car on ramps or jack it up on the passenger side (front).
Loosen but do not remove the bolts holding the flexi pipe to the downpipe.
Now off the ramps at the front and up on the back.
Undo the U-Bolt at the joint with the back box, ff you can pull the exhaust apart great, if not then use an angle grinder and cut it off as close as you can to the rear axle.
Crawl back under the front and completely remove the bolts at the flexi end and the exhaust should come off, I cut the rubber exhaust hangers off as I was replacing them with new.
Put the new rubber hangers on the car before you put the new exhaust on
Now, with the rear passenger wheel jacked up well off the ground, wiggle the back box pipe up and over the axle...this is a pain in the bum by the way.
Once that is done, put the flexi over the studs and do up the bolts, but very loosely, then liberally smear jointing paste over the end of the centre pipe and slide it into the back box and put the U bolt in place but again do not do the bolts up very tight.
Now put the exhaust hooks into the rubber hangers, prepare for swearing doing this, especially the double one for the back box, some people use washing up liquid as a lubricant, I used silicon spray.
Once the hangers are done and you are happy with the fit, do all the bolts up and jobs-a-goodun