Welcome to the boards
As for leveling, it will all depend on how much you want to spend. Cheaper option is a spacer block an ideal option is Bilsteins as it levels and swaps,out yor shocks for something better.
Full blown suspension? Not needed.
Level spacer $100
As for intake? There is a wide array of choices. And this will depend on preference as many fall with the same dollar amount.
Many here run vararam, S&B, Airaid, aFe and K&N
If you like the K&N, stick with it. CAIs are more noise than anything. True performance intake is the vararam
Any help or pricing, let me know and I'd be glad to assist.