Whilst I know a decent set of headers would add some power to the n/a v8 I'm not too keen on handing over 3500aud plus having down pipes made up on the off chance that they will fit when designed for xk8.
Having said that has anyone had actual experience with having their exhaust manifolds ported before.
For reference OEM n/a are 4-2-1 branched style not the log variety