Seriously, I would check around with people that have had work done. I have had N/A piping done but it as not as involved so local shops get it done. Most little garages that have the equipment can do o2 bungs and run any kind of piping.

If you want to be welding SS or something harder than aluminized steel (common stock of most smaller garages) and working with a more complex setup you want someone that works with imports/turbo setups.