The V6 engine in your roadster is a smooth and very balanced piece of machinery and because of this it is tough to get a sports sound out of it. I bought a Librands which I had my dealer fit. Those standard fit lumps were replaced with more athletic, straight through, stainless alternatives. i might add that the standard exhausts would never "snarl" above or below 4000 revs not even if you trod on its tail. The Librands improved the sound but never to my satisfaction. I looked into the 100 cell CAT that Morgan Hamburg were selling at the time, this was reported to be a further improvment. Fear of MOT failure meant I left that alternative alone. Ring round the dealers they may have found better solutions in recent years.