If you're not interested in doing a tune, you can always do a Soft ECU Reset.
Simple:
1. Locate Battery
2. Remove Negative (-) Battery Terminal for 3~5 minutes
3. Reattach Negative (-) Battery Terminal
4. Start Car
When you start the car, all your radio settings and driver computer settings will be gone so you'll need to reset those.
After starting it, let it just sit and idle for about 5-10 minutes. The ECU is "relearning" your specific air input/output meters and adjusting accordingly. After that you'll wanna spend another 5-10 minutes just gently giving it throttle to different RPM bands and let it work through that.
Then, road test.
Take it out for about 20 mins of just commuter driving. Don't really get on it. Make turns and stop and goes so it learns that. Then take it somewhere and ring its neck for another 20 mins or so, WOT is fun.
This will help the ECU accommodate the changes you made. Be it intakes, HFC/TPs, CBEs, Intake Manifolds, anything that has to do with the breathing of the motor.
Sounds more complicated than it is in practice.
Saves you $600 too.
