Car is used as a spare/runner because my truck has a drinking problem when it comes to city driving.

CX-7 is a good little car but is extremely week. What would be the most efficient way to turbo it?

 

There's too many little things like extra vac lines etc involved with those stock turbos to the non turbo models. Your best bet honestly is the turbo kits off eBay in my opinion. Would cost about $1000/1500 completely done. Run somewhere around 10psi to play safe. Finish with an exhaust and a cold air filter.....