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the reason u make more power is because ur increasing effeciency of the motor thru breathing mods..
both thru air in and air out..
exhaust systems, and intercooler pipes, FMIC itself, CAI etc will all help get the air where it needs to go in a faster smoother more linear way...
even if the ECU (not cpu) compensates for the assoc. increased boost, and returns it to it's previous point.. u will still make more power especially in the top end where the motor actually creates a vacuume in the intake because it is "inhaling" faster then the the intake can replace the air
and exhaust back pressure prevents the motor from expelling it's gases fast enough..
FMIC's will help prevent Heak soak.. which will keep IAT's lower for longer periods of time.. and their benefit is more noticable the longer u use it.. (long pulls, or quicker drops in temp after heat soak)
design of FMIC plays a role as well.. such as bar and plate vs tube and fin for example.. Pressure Drop, as well as CFM flow
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