BMW M135i (F40) GPF/PPF Back Performance Exhaust
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These BMW M135i (F40) performance exhausts are made in 3" (76.2mm) pipework and fit from the Gasoline Particulate Filter section backwards (GPF-back) this exhaust replaces the centre and rear sections.
All relevant fittings and gaskets are supplied.
This exhaust offers improvement in terms of exhaust tone, bass and sound level whilst keeping the stock catalyst and GPF in place. This exhaust system has been designed to be easily upgradable to a full turbo-back exhaust in the future by purchasing additional sections.
This exhaust has a choice of 4" (101.6mm) and 4.5" (114.5mm) tailpipe options including a choice of carbon fibre tip options.
GPF Back with Rear Box Test Results:
Sound - Engine at Idle: 72.3dB (+9.3dB) - Static 3,800rpm test: 87.2dB (+5.2dB)
Weight - 10.4kg (-7.4kg)
The 'Valved' exhaust retains the use of exhaust valves. When switching drive modes (e.g. Eco to Race mode) your exhaust tone will continue to swap from quieter to louder tones as before.
The 'Non-Valved' exhaust removes the use of exhaust valves. When switching drive modes (e.g. Eco to Race mode) your exhaust tone will not change from quieter to louder as before. Using a Non-Valved exhaust will not harm the running of your vehicle, you will simply not have exhaust sound options, however, the Cobra Sport exhaust has been designed with this in mind.