Just had these beauties built & fitted. A local s/steel co. did them for me for £500. I really liked the sound of the X-Power's but I really preferred the quad look. Also, from the sound bites I've heard, the Zeroes weren't too far from the originals.
Now she barks & bellows like a good'un, fantastic.
Steve.
(There are two tunnels I go through when I go to work...can't wait.)