I was curious as to what year the 1.8 came out of since it wasn't the original engine? What kind of power did it make when the boost was set at about 9 lbs of boost? Those things are known to make less power at a higher boost setting due to the factory knock sensor. read up on it: http://www.flyinmiata.com/support/M2.asp
http://www.flyinmiata.com/tech/dyno_...ons_121201.pdf
Run 16 is at 9 psi while run 11 is at 12 psi.

Just something to look into and to ponder.....