Not much gain but remaps often make a car more driveable and smoother.
From the factory, the map will be all about emmissions (on newer cars) so a map can improve things.
I had a map on a 300hp car and ignoring the extra power, the thing i first noticed was just how much nicer (not faster) it was to drive in town.
On thing to note is if you have a manufacture warranty on your car, any map will prob void it if anything goes wrong as they can detect changes to the ECU.
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