anyone who has there engine out and wants an upgrade path would buy manifolds if they were available and cheap enough. The secret is that you have to make it a bolt on with a down pipe and external wastegates. I love to have some pentroof manifolds and 3037s if i could get it for less than 4K.
Haven'tyou heard the expression. If you build it they will come? How about you just send me those manifolds and I have a set made from them :-)