Instruct: Classify Amazon reviews into positive or negative sentiment
Query: K&N replacement filter......

I've put K&N filters in every vehicle my wife or I have had, (at least a dozen), and believe them 2b a useful and beneficial purchase. I've ordered 3 or 4 since I've been buying from Amazon and have never received the wrong one (provided you make sure you're ordering the exact one for your engine application, etc.). Came within a few days without paying extra shipping charges, as always from Amazon. And now I never have to buy another engine air filter. Good stuff.