Last year my civic failed the missions by a mile, so they put some fuel cleaner stuff through it and it passed ok.

So roll on this years MOT, it failed again on emissions, so he took off the filter for some reason and he said not only does it pick up better but it passed the emission test with a perfect number? is it a coincidence or could the cone filter really be the problem?

Ill be getting a standard airbox for sure, especially if it makes the car run better