K&N doesn't make a bolt-on kit, but the KKM is an ok kit for the price, and there seems to be a consensus that S&B filters (which KKM uses) are slightly higher quality and filter slightly better.
You can also build your own cold air intake by just buying the aluminum MAF housing adapter (they do sell cheaper steel ones too, but pay a few bucks more for alloy), then buying the universal cone filters with the correct 4" opening. Auto parts stores tend to sell the K&N version for about $40 + tax, the adapter is usually $10-30 depending on what you get, so $50-80 complete. The KKM kit is "better" in some ways since you just get everything you need in one shot, plus it uses the newer S&B filter that has an angle to clear the fuse box. I think it's also great to support those who make such performance upgrades for our vehicles, when they stop selling so well they might stop making them, so every time someone buys it helps everyone else down the road who might want one.