The joy of Ebay! that's too bad. When you heard mine at Blenheim a couple of years ago, that was with just the X and before I added the cats so it's not too loud but still gives you that little extra something.
Exploded silencers parts diagram for the Maserati QTP. (2006) 4.2 F1
www.eurospares.co.uk
But even the regular one is already an x-pipe, just with a silencer, that can be cut of and replaced with two pieces of straight pipe for under £100 by any exhaust shop; this is the best solution I've come across, and it was posted on here previously: