From the FIA GT regulations:
5.4 Supercharged engines
The maximum capacity of supercharged engines is 4000cm³.
5.4.1) A compressor and/or turbocharger may only be used if such systems are fitted to the road car homologated by the FIA or from the list of acceptable cars drawn up by the FIA or if the car is homologated in N-GT and has a normally aspirated engine as standard. If the car is homologated in N-GT and has a normally aspirated engine as standard, the supercharging system must be homologated in VO by the manufacturer. For cars from the list of "Super Cars", the whole original supercharging system must be retained and not modified, with the exception of exchangers and pipes between the supercharging device, the intercooler and the manifold.
5.4.2) The engine air intake system must be fitted with one or two air restrictors 3 mm long with maximum diameters set out in Appendix 2. They must be made of metal or metal alloy and must be entirely visible once the bonnet is open and without dismounting any element or cover.
5.4.3) All restrictors must be placed no further than 50 mm from the forward face of the compressor wheel blades.
5.4.4) All the air feeding the engine must pass through these restrictors. Sealing the restrictors must lead to the immediate stopping of the engine. This check must be made at an engine speed of 2500 rpm. Pressure sensors present inside the intake system must be disconnected.
5.4.5) The right is reserved, by the Sporting Authority of the relevant Championship, to adjust the size of these air restrictors to maximise equality of performance.
5.4.6) Supercharged cars must not be equipped with any device which allows the boost pressure, or the electronic management system controlling the boost pressure, to be adjusted while the car is in motion.
5.4.7) Variable diameter inlets and adjustable internal vanes on turbochargers are forbidden. If the original car is fitted with such a system, this system must be neutralised or dismounted.
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