What would it take to use a 1.8 FM kit on a 1.6? With a 1.6 FM manifold, would the turbo be in the same position as in a 1.8?

 

Flyin Miata sells a different downpipe for the 1.6. Downpipe or mid pipe could probably be modified easily enough to work with each other. They also sell an NA6 specific compress to intercooler pipe and Throttle body inlet pipe.