I have a '94 Miata "BPT" as you guys call it. It's a DIY setup with a T3(Saab)/T4(International) hybrid. AEM EMS, 550s, EVO6 FMIC, Corolla COP ignition conversion, and bawls to the walls power. I'm running about 14psi on the stock 1.8L BP engine with 160k miles on it. The Mazdaspeed turbo Miata is a piece of $hit, don't bother. I've PWnD a few GTs with my Miata. The new engine is being built on the side and WILL do 450rwhp. Key work here. REAR! The mx3 isn't going anywhere with a turbo on it. The Miata will stomp an mx3 to death all things equal.
I'm trying to trade my '98 Civic for a '94 mx3 actually. =) Anyone want a Civic? haha.