I have experienced X Powers on 455, standard silencers on 288 and these custom made tail pipes on 700 (but I don't know where they were made) and the latter is so far my favourite - a really nice sound, but not too noisy.
Perhaps I need to re-evaluate the X Powers with the famous sleeves.
Tony Dennis
I counted them in and I counted them out (with apologies to Brian Hanrahan) - 005, 007, 019, 051, 103, 288, 354, 455, 577, 700 - the story continues.