Quote:
Originally Posted by RayRay88
I have a MY 2017 86 with 5000km's, it makes the exact same noise you are describing. I notice it's only after the engines been at a low and relatively steady state rpm. On occasion if I rev match down shift it makes the popping noise, and it can be heard from the sound tube in the passenger side foot well. It startled me a few times but it's definitely been happening since it was new.
Out of curiosity have you changed the Air filter to a high flow one recently or modified the snorkel at all?
Edit: forgot to add It happens on both Shell V-Power 92 and Ultra 94.
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My 2017 does this too. I've also heard it in my buddies 2017. I've swapped to the older air box and k&n filter, and it still does it, so I don't think it has to do with the 2017+ air box. In his car, it's much quieter with the sound tube plugged.
It only ever happens when I mess up and give it way too little gas when rev matching. I don't think it's a big deal, just give it more gas when you're down shifting.