Your looking for a
Dynojet kit. It will come with a few different sized of jets. You can find the kits cheaper on ebay and amazon though.
K&N high flow air filters will perform better than stock when installed in the proper direction.
If your gunna drop near 5 bills on a full system but need to split up the purchases, give
AreaP a call. They will sell all 3 pieces separately but not sure of the costing when purchased that way.