K&N, S&B, and AFE all connect to the same fresh air duct in the grille. Which is about half the size of your drop in filter. Fen Fab is the only intake that doesn't have that as a restriction. However longer inlet pipes also make the turbos less efficient.
All the tuners say you don't need a retune for an intake. Mainly because the EFI is speed density. The factory computers can tune for +/- 10,000 of air density which is nearly 5 PSI of ambient air pressure.