My Exige S1 is running with the lotus A340E6004F foam cone shaped filter, fitted this year after the original disintegrated whilst the car was in lay-up.
Originally my Exige had two of these cone filters fitted, one was removed along with the resonator valve by the Lotus garage when the first service was carried out.
As flimsy as it looks in the 64,000 or so miles the original cone filter was in use, it was never been penetrated by.
Good hunting.
PS, the original backplate for the carbon fibre and composite airbox part numbers are A340E6002F and L0990004, picture included.
