installp

I am the previous owner of two Miatas just purchased first RX-7. I have never owned a rotary powered car and joined here to learn all I can about the car. My car was purchased from the original owner car with a documented 150K miles on the car and 50K miles on the engine. How long will this engine last me if maintained? I got 245K out of one of my Miatas. I understand the RX-7 responds very well to exhaust mods and this will be my first area of focus. Any advice to this new guy is appreciated.