16v Conversion - Standard Exhaust?

Intrigued by a 16v conversion but maintaining as much of the original aesthetics as possible, so was wondering if a standard GTi exhaust can be mated to a 4 branch manifold or would an upgrade be mandatory?

depends on the 4 branch, but usually they're designed to fit a std mk1 exhaust

Cheers mate, that sounds like good news, maybe not so much for the wallet!