This was taken from my own williams 3, I hope i've given you enough photos for you to view it as much as possible - (note the internal pipe shot :) )
The pipe is 2.5" internal diameter and 3 across the full pipe, im unsure of how officially they're measured.
£170 Delivered
£150 for cash on collection from midlands, near nuneaton.
http://i250.photobucket.com/albums/g...t/IMG_0041.jpg
http://i250.photobucket.com/albums/g...t/IMG_0022.jpg
http://i250.photobucket.com/albums/g...t/IMG_0020.jpg
http://i250.photobucket.com/albums/g...t/IMG_0047.jpg
http://i250.photobucket.com/albums/g...t/IMG_0021.jpg
http://i250.photobucket.com/albums/g...t/IMG_0051.jpg
http://i250.photobucket.com/albums/g...t/IMG_0044.jpg