Salsa Guy wrote:If you have an FWD 05+ Vibe/Matrix/Corolla you'll need the throttle body adapter. Also The TRD ECU will NOT work on your car.
If you have an AWD/4WD 03-06 Vibe/Matrix you won't need the TB adapter and can use the TRD ECU.
For a used complete kit in good shape will run about $1.5K. An AEM FIC 6 (Piggyback) will run about $300 then Tuning will run about $200 to $300. This isn't including an adapter wiring harness for the AEM FIC 6 which is $200 but it can be hard wired if you can solder and read wiring diagrams. These things can be purchased used about 50% or less than new.