Well i changed my HKS filters the other day. My engine bay looks really different with yellow instead of the greyish green. HKS has has a reputation for its filter systems not being able to filter all substrates, especially when the filter is dirty, so its good to change the filters regularly. I did find some small black deposits in the pipes, but there wasnt much, the old filters were actually surprisingly clean. You can clearly see which filter was on the primary turbo as i rarely take the car to full boost.
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