Anyone notice this sound?
 

Been driving around the GR86 for a few months now and at around 4000 miles. Has anyone ever pushed the RPM hard and whenever you engage the clutch around 5-6k miles, you hear this "woosh" sound coming from the engine bay before going up to the next gear? almost like it has a blow off valve (despite being an NA)?

Airbox/intake sucking in air most likely. Blip the throttle up a bit at a stand still and you'll hear it too. I noticed my GR86 does this but my previous 86's did not (my BMW also does it).

Yep!

yup noticed this immediately on mine, just intake noise