tuneing chips dont work on normaly asperated petrols some people sell resistors that make the ecu think the air is colder that it is so the ecu injects more fuel they claim 5bhp increase you cant feel 5bhp you may as well up your tyre pressures by 15psi that will give you better performance due to less drag or polish the car
ecu remaps are the only way to increase the power accross the rev range
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