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Yes, to keep things cooler but it's interesting because there is also a big cut out of the protection that im sure would allow decent air flow up there anyway. I haven't seen the ducted one fitted before and thought it was a nice touch. Perhaps is region specific for certain 850 models but there's a limit to how much i could find online.
My thought process was 'airflow is good' so lets install it.
I do have the normal sump protection sitting in my shed - new from GCP. Like this one:
I've done a bit of reading about the japnifold, can you tell me more about it? There's a sound difference but power increase isn't much, if anything? Would this be right? Or maybe you can educate me on the differences between the T5, T-5R, R & japanifold?