hi I have a mk ii 16v I would like to turbo I already have a 1.8 audi turbo but I'm not sure of the compression ratio if it will be straight fit or do I need to play with the internals
You'll need different camshafts and pistons as a bare minimum too. And all the duct work for the intercooler, exhaust manifold, inlet manifold etc. It's a big old job.