inferno94
+1y
Check out these guys everything has been done there. There have been miatae with klze's in them but there are issues ex, kl's are designed to be at an angle so the oil can drain mounting it upright can make drainage very difficult. There are unlimited numbers of turbo kits for the 1.8L bp, the highest hp bolt on afaik is 265whp from flyin miata. for v6's there are items like suzuki vitara 2.5 and 2.7 motors, these are rwd and guess who helped suzuki build em? They are essentialy rwd kl motors complete with trans (at least in 4wd trucks) and are turbo friendly with potential for 600-800hp.
Most miata owners don't bother with all these other motors cause their bp's potential is almost limitless, especialy when a 2L stroker kit is added ($2g for 150cc's).
I know ther'se other questions out there so ask away!