Turblown Engineering has developed this 300 to 350rwhp turbo system package for your 2004-2011 Mazda Rx8. This setup has been developed from over 18 years experience with turbocharged rotaries.
For this particular HP package the EFR 7670 IWG is the best choice with the fastest boost response. It generally makes the following power levels;
300rwhp @ 10 psi on pump gas
350rwhp @ 15 psi on pump gas
The 7670 EFR IWG turbocharger incorporates a built in bov, wastegate, and boost control solenoid which makes a very clean, efficient and reliable install.
You can view the turbo system here
Read more about the IWG turbo systems in this blog post
This setup does not require any engine modifications, assuming the engine is in good condition. It also works properly with the factory return less fuel system design.