Go with the AEM panel filters in the stock air box. They are less expensive and I went even faster once I switched from the K&N panel filters to the AEM ones. Plus the AEM ones are dry. They are great in my opinion.
The OEM air intake setup is highly restrictive so give your beast the fresh cool air it needs! But why pay more for less? The mouth on these air scoops dwarfs the competition while still maintaining a stylish yet mean look behind the grill. Don't mistake the lower price for inferior quality...
It feels a little faster, but I installed them before I broke-in the engine, so was not getting too hard into the car yet when it was stock.
After seeing first hand how restrictive the stock intakes are, these have to be a good step up. For $230 between the intakes and filters, i think it is well worth it! Bumper removal was even easier than I thought it would be.