Nuno Henriques

Hi guys. New here and I'm from a sunny paradise called Portugal. So, I own a w220 320 cdi and the airnatic is killing me. Bought already 3 struts and the car still have issues. So I really want to solve it for good, with a coil conversion. Straight question? China/aftermarket will solve it or have to buy those arnott, bilstein or other brand for 2k? Thanks!