Hayward and scott are very pricey just so your aware, a exmaple friend for a fiesta project asked haywood and scott for a exhaust it come out around 500quid and pipecraft 180 however the metal and gurantees etc probably come into play at this price range but still its a lot more money but pipecraft one of the cheapest in essex, have friends that have used them but all of them are N/A engine boys
lol. just ring around and get a few quotes mate. and see if anyone has used any of there exhausts and what there like, you can even possibly pick up a decent second hand system in the for sale section! ( if your lucky )