yeah you need a fabricator for the downpipe since its a topmount setup to get past the steering box.
but the intercooler piping for an air to air kit you can get on ebay.
on eurocca.net there is a e30 325i with using a TCD manifold, but I cant find the link now. you have to goto the RHD bmw websites eg UK, AUS, south africa or NZ and have a look around to see what others have done.