There's a couple businesses that can do it. I would think that most shops that can make you an exhaust would also be able to make you an intake. Check muffler shops, racer shops, such like that. They can bend pipes differently *may I suggest MANDREL bends, not crush bends...make sure to ask!* or get 'em in all sorts of weird sizes if you want. Hence the term "custom." The main reason to get a custom intake though...is that unlike HONDA, there aren't too many "performance" parts built specifically for the G20...hence the need to make a custom *and often much better* intake system.