Replacement 4" Air Filter

Great sound and airflow

Bought my car with a Dflow. It was dirty so i decided to buy a new one. Didnt know the difference but im glad i picked SynoilD! Started getting turbo noises i never heard before and I can feel the difference! Try not to push it too hard in one place while installing or itll start crumpling. Super easy too install just a hose clamp.

Super High Quality Oiled Air Filter

I bought the CP-E cold air intake kit for my Focus ST and then bought a second oiled filter so I can swap them and have zero down time while the used one is set to dry after washing. Excellent build quality, there is no deformation even after using them for 2 years. The mesh pre-filter pairs great with this filter too.