The 1839 cc Miata motor only needs about 220cfm airflow to be able to turn 7500 RPM without dropping off HP. I spent $40 to have my OEM 1.6 flow meter checked, it flowed 165 CFM. That is only enough flow to support a 1839cc motor to less than 6000 RPM.
This is literally a question of "how much money do you want to spend". a budget 400hp build wouldn't be but if you went all out on the build, replacing the engine internals, gearbox and diff and everything else weakened by large HP, then you would have a reliable car. But that costs $$. Not. It's not practical. If you do enough to the block you can get over 600hp on the 1.6l. See this infamous build.Underhood shot at 7:12 He has a built bottom end, stock head, valve springs, head studs, precision 6262, RX-7 Turbo II trans and diff, custom axles and driveshaft. 37 pounds of boost gets him about 540hp and revs to 8700. So you have 300 HP now and put 12 psi on it you would use the formula (12/17psi)300+300= total FLYWHEEL HP which is just above 500HP. To get 600 FWHP from a 300 HP engine you would need the indicated 17psi. Again, the more you make the supercharger work, the less efficient it will be.
The current-generation Civic is a very good compact car that can handle whatever you throw at it. Mazda MX-5 Miata ($25,295) It makes 332 hp and 270 lb-ft in the standard 370Z, but Nissan
Moxnix, yes, a factory hardtop would be enough to make the car eligible to run in spite of being a 2 seater. In reply to Don49: Thanks for the tip - I can defintely go further than a Spec Miata; figures an SM would jsut be a good reliable base to start with.
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The thing is, if you truly love the car and want it to last, even in drifting, you will want to get a 2 way because they are ideal for drifting and they are very predictable. You can get away with a 1.5 way but it's not ideal. But to what in saying, if you weld the diff while it's in the housing, the heat can get to thr bearings as well as housing.

Getting higher compression pistons also negates the need to shave the head to raise compression. Flyin Miata offers Wiseco pistons and Carillo rods for 1.6 engines, which are both considered high quality. There are a few places you can get cams for a 1.6, but it might be easier to get a shop to grind the existing cams for higher lift/duration.
I am looking to increase the HP of my 1990 1.6 Miata. The car is mainly being built for a track car but I still enjoy driving it on the street. This past year I have worked on getting the suspension sorted out, and I am now running 700f and 350r springs with Hoosier 205/50/15 SM6’s. The car handles great. I am thinking of power goals of 180
XONRA9.
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    • how much hp can a 1.6 miata handle