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Hey Mikee55,
It may be completely unrelated to the mods that you have made. Depending on age and miles of the vehicle and if you noticed low power before any modifications, a slowly clogging intake manifold could gradually choke airflow or an aging MAF sensor can gradually reduce power.
The power losses may also BE linked to the modifications. Filament type MAF sensors (if this is what the Renault are equipped with) are sometimes sensitive to modifications made to air flow depending on the vehicle and if you deleted the factory airbox and installed a oil type air filter (like a K&N cone filter) the filter oil will destroy the MAF sensor filament.
Not knowing the age or miles on the car, I would first unplug the MAF sensor and drive the car. If the car runs better with the MAF sensor unplugged than your MAF sensor is bad and has to be replaced.
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