not true, You need two turbos. each turbo will only work on half of the engine. then each turbo will work with 2.1L from the engine. now the 1.8L uses K03 and upgraded version K04. they are cool, but If you trully seek power you need GT28RS which works fine with 2.0 L engine have some lag but its fine. it will almost give you 50% increses in power. the K04 will give you less lag and less power to it self too. K03 you wont even feel the lag but power is segnificant. with K03 I believe you will max at 10psi and overiding it. with K04 probably 12 psi at max speed. and GT you will get 25psi at normal. if you want moderate go with cheap K03 and if you wont more get with others.

and gt40 is bad for your car couse well the engine wont be able to spin it unless you combine both parts of the engine.
go to www.mazda626.net and go to how too section and read about how to make your car sneaze.

and we can go on, just IM me and we can talk more on this subject.