Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Expensive and caused strange issue

Once I installed this filter into my Audi A4 there was no noticeable difference in power and, for some reason, the tachometer started jumping around erratically -- small jumps, but enough to feel jerks in the car while cruising at about 30MPH. Because I had not done anything else to the car other than install this filter I decided to try a different filter, which I bought from Autozone -- the problem stopped. Strange problem that I can't figure out, but why try to figure it out? Don't get this filter and instead go to your local auto parts store and don't even think about it.