If I buy a Stage 3 Turbo Kit for a Mazda RX8 could I just switch that turbo for a bigger one?

Turbo Kit Type 3 for RX8: http://www.mazsport.net/store/index.php?l=product_detail%26amp;p=16





The turbo I want to put on it:


http://www.turbobygarrett.com/turbobygarrett/catelog/Turbochargers/GT45/GT4508R.htm|||It is a matter of how much boost do you want.


There is a point at which a bigger turbo charger would be needed. You need to compute the amount of boost you want, then figure out how many CFM it takes to achieve that boost.


A 1600 non- rotary engine needs about 300 cfm at normal atmosphere (no boost) when running at 7,000 rpm. So if I want to run 15 psi boost, I would need a turbo charger that can produce 600 cfm. So i would look for a 700 cfm turbo.


So I am not sure, while I can compute it for a cylinder engine a rotary is beyond my knowledge.