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Thank you for the reply.
I have looked at the 987 airbox and before the maf but after the filter there is a 90 degree turn that constricts air flow to less than the 83mm id of the 987 maf tube. Difficult to judge exactly what it is due to its angle and turn but I would suggest around 70mm.
With the above in mind what is the point of the larger 987 maf tube over the 986 maf tube? All that is happening is that the restriction is moved closer to the air filter.
Any thoughts/comments?
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