.I have read the threads you refer to. That is why I started this post. It seems like everyone has their own interpretation on whether or not removing the stock air box produces power. Like I said in my previous post. All of my previous cars I have added the K&N cylindrical filter and have always felt an improvement right away. It seems better air flow usually means more horsepower. That is why I wanted a straight answer. What works Dual K&N's, Single K&N's, Stock Airbox or Stock airbox with standard K&N's? Maybe leaving the car bone stock is the best answer. Thanks for helpful replies.