ive cored my trackday pipes , i used the ducatisuite method but took a bit more care than they when making the hole inthe end. drill round it and open it up with a file, it releases the propper sound and allows much improved gas flow, i run an open pipe chip with this and it runs fine.
i wasnt able to source the perferated tube necessary to go the other method. but if you could always do this in the future if you were unahappy with the ducatisuite method
Bought perforated pipe and wadding from JP Exhausts(excellent firm to deal with)to rebuild a Termi can. They have a web site,sorry but cant do that highlighted link bit.
If I wanted a standard look I'd just core the exhausts as mentioned above. Be a waste buying termi's and then replacing the sleeves with standard ones (which I doubt would fit anyway!!).
I also doubt you'd pass your MOT with Termi's, they don't just look at the sleeve and think "oh they must be legal then". They do actually (or should do if they're doing their job right), test the db level output at a given rev reading.
I know they're doing such spot checks here on the island, having an e-legal stamp means nothing if it's not within the db limit.