You see, the thing is I am not going to order it, I'm going to make it at a local custom exaust pipe fabricator here, which will cost me a lot less since I don't have to ship it overseas. So the concern is, if I custom-make one for my 1.3L engine, will it fit the 1.6L 16v engine? I always assumed that the 1.6 8V and the 1.6 16V have the same engine block but the difference lies in the engine head.
I want to make sure I protect my investment, as Cisco likes to put it

So if I invest in a header for my current engine, then decide to upgrade I'll protect my investment.