here's an old thread that i've posted some local info on shops here...i know moto-r was in the process of moving ..so some of these shop info things might be dated.
604 performance shops thread
you'll probably want to check out a&j... they've got quite a set up running...not to mention they're the only official dealer of spoon products in north america.
also technik is another reputable performance place..they've got a dyno too if you want to make some runs.
the rest are mainly places that do basic bolt-ons, minor engine mods, turbos, s/cs, and lowering etc...technik and a&j would be the places to get the massive engine swaps, crazy work done.