I reckon you guys are missing the basic difference of petrol v diesel. Diesel engines have no inlet manifold vacuum, and turbo chargers actually mean manifold pressure. The turbo is pumping air in negating any engine braking. Larger engines use Jacobs type brakes to alter valve timing to make the engine work as a compressor, and even these can have an effect on engine life. Engines fitted with an inlet manifold help stop the turbo feeding more air in when not needed, my l322 td6 is awesome when in sport mode coming down the hills at the back of Cairns. I have run an exhaust brake on a Perkins T6.354.3 for many years in my 4x4 International with no adverse effect(it really makes people look twice when roaring into the car park!!). I have no intention to put one on my old defender though. My two bobs worth from a layman.
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