i had a custom 2 1/4 inch made to my car, but it would be good if you could do it yourself. From the rs manifold, the mk5 dont fit, plus if you have a 1.5 inch bore on it, it restricts it to like -14psi... so ensure you have 2inch or more bore.

Custom made one is the best, i paid £300 with a 4inch exit.

Make your own out of sections, try it if you got lots of time.