depends if you want a decent one or not, they can be made to work for cheep but chances are they wont provide great flow or look that cosmetically pleasing, if you want to get the top performance potential out of the exhaust then it will cost you either way, i made a full tube SS system from scratch for my blackbird engine and the whole system inc Cat and back box cost about £600 in raw material add onto that the hours it took to make and the cost of argon and SS tig filler ...... im sure you are getting the picture, i have plenty of comments on how nice it looks etc and it also does the business of giving about an extra 10HP with no other mods to the engine.
i have to say im not sure what the going rate is for a bespoke manifold but i expect if you went to a pipe shop with a CNC tube bender they would be able to do the job very quickly, too a very good standard at a good price.
hope this helps
tilly
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