Quote:
Originally Posted by acelesson
If you change the intake and exhaust at the same time you need a tune?
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It depends. The ECM can adjust for a certain amount of change. Once you exceed that limit, you need to retune the ECM.
In many cases, changing just the intake or just the exhaust is within what the ECM can handle. But it may not do it as well as a retune.
To get the most from any mods, a retune is a good idea. Or if you just want a little more oomph/responsiveness in your OEM setup.