Originally Posted by laperacfo
ECU tuning is usually a waste of time and money on NA cars. You will get more hp and tq with bolt ons.
Just a clarification.
ECU tuning is the last thing you do AFTER the bolt ons. For MTs, ECU tuning affects fuel mapping and timing (shift points for AT). If a tuned ECU is the only thing you do, you are wasting your money.
If you upgrade intake, manifold, header back exhaust, port, polish, bore, compression and injectors, an upgraded ECU will make everything work together.