If you are turning it up full ball and not much air is coming through, it might be worth changing your pollon filter.

Take off your glove box, undo a few screws behind it and it pops out. Its also a good idea to do this if your car is getting pretty smelly.

Mine was only 3 years old when I first changed it and you wouldn't believe the amont of crap in there. Leaves, Hair, grease, dirt, skin, it was like emptying a vacuum bag.

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Twin scroll Pig Bi-Squeeling