Twin turbo vs single supercharger
If you want the most horsepower get a twin turbo kit. If you to have instant horsepower get a supercharger. Turbochargers can build more boost than superchargers and superchargers are limited by your max engine rpm. Usually superchargers don't need any fabrication done to them.
Looking for a Used FR-S in your area?
CarGurus has 969 nationwide FR-S listings starting at $8,588.
Search Scion FR-S Questions
Scion FR-S Experts
Related Models For Sale
Used Cars For Sale