Lol...good! try supersprint http://www.supersprint.com/homeuk.htm or for cheaper ones try Peco, Magnex etc
magnex are good exhausts, or if you have some extra cash get a stainless steel powerflow exhaust, you can have it any size you wish and any loudness. lol they also come with a lifetime garantee
Personally i wouldnt touch powerflow. All show and no go! And some of the bodges that i have seen done by powerflow are unreal. I had a mate with a fiesta where they ran the exhaust right beneath the petrol tank. So close infact that it melted the tank! Nice
Alan