This brings up the question of which is better - the GMPP or K&N? Of course, there is the issue of availability. Crate Engine is out of stock, neither does GM, and Crate has been waiting on some to fill orders. Look on e-bay as there are some K&Ns for $275 shipped.
For the K&N you WILL need some MAF spray cleaner as the oil from the filter WILL get back to the MAF. don't use anything else but MAF cleaner - trust me as I KNOW (don't ask!!).