I wouldn't recommend a K&N. The power improvement is way overhyped and some cellulose filters out flow them size for size.
Their ability to trap particles is highly dependent on oil content, and as the oil content slowly degrades their filtering efficicency goes to hell. Also, excess oil can cause problems with MAF sensors.
For the cost of a K&N you can buy two OEM Bosch filters or other quality name brand cellulose replacements.
Finally, their "washability" is not much benefit. In addition to the time and hassle there is no way you can wash away all the tiny particles that a good filter will trap. That's why modern filters are designed to be thrown away.
Look at it this way. Would you wash out your oil filter in solvent and reinstall it?