Maps additionally Mazdaspeed Cobb Accessport permit you to tell your ECU explicitly what power alterations you have done and how you need them running. Assuming you have a new downpipe that streams better and Max Stream Fuel Siphon Internals, then, at that point, your ECU will require another guide introduced that tells it how to control the lift levels by controlling the waste entryway, the flash development, ideal fuel pressure, fuel manages, and numerous different things.