"Sidepipes" (Gary) puts out nice quality work/products and is relatively close to you.
You also have Powerspeed nearer to you
http://http://www.powerspeed.co.uk/ (they did my headers - no probs)
and Zero
http://http://www.zeroexhausts.co.uk/ (did Danny B 's pipes - lovely)
Both the above are in the Ashford area