I would have thought they didn't put the K&N filters, de cat pipes, sports end cans etc etc due to emission regulations, they would have to make it legal in most countries so a minimum would be set???
The reason to go with a K&N filter isn't the magical mystery "more horsepower." It's that you can go with just one lifetime filter that you can just clean, instead of disposable filters.
The reason to go with a K&N filter isn't the magical mystery "more horsepower." It's that you can go with just one lifetime filter that you can just clean, instead of disposable filters.