I could be wrong here..But I think the flange is different - you could be in trouble when it comes to fitment.
http://www.ebay.co.uk/itm/MITSUBISHI-FT ... 19cb120f65However as the "channel" under the car is the same a good (good and proper) exhaust fitter should be able to chop up your old system and use the fittings to weld on the new system.
If it's a case that the diameters are different they'll need to make a "reducer" for you.
The cost of this may outweigh the savings though..
There's a couple of custom places dotted around Ireland...
http://www.souhan.ieThere's another place in Balbriggan, I forget the name..