If you have fitted the BOE or other aftermarket CAI kit on your Evora, you have inadvertently removed the factory vacuum reservoir from your car (it is part of the OEM air filter housing lid).  For most cars with aftermarket exhaust or non-sport mufflers, this is of no consequence.  However, if the car is equipped with the EP Valve (Engine Protection Valve AKA “loud sport exhaust”), or an aftermarket exhaust utilizing the same style vacuum operated bypass valve, you should install this vacuum reservoir to ensure proper function of the exhaust pod. 

Installation Instructions can be found .