Cheap and easy efi 1.3 upgrades?

[william]

Timing bump with higher octane,and the free air box mod.
Drill a bunch of 1/8 inch holes in the bottom and drop in a k&n.
Not sure how much this really helps but it's free if you don't get the filter.

[cliferton]

So I just picked up a 1990. Eventually a swap will take place, but I'm going to sort out the suspension, wheels and tires, and get a couple other projects done. On miata 1.6 motors common cheap and easy mods. Are to advance the timing 10*, diy intake, and swapping the air meter for one from a fc rx7. I was curious if timing advance was common on the 1.3? Does anyone swap to a miata 1.6 afm? I know if intake is messed with the exhaust side needs to be opened up also.