Lots of horror stories of the ports not lining up, or the stud holes, of the downpipe hitting the steering rack (LHD manifolds being sold in the UK).
The 8v and 16v manifolds are no where near restricting until you get to 200hp, as Ess_three found out in his 199hp valver. You're better off either saving your money, or if you insist of getting a manifold then getting a well known brand from an UK dealer.
