[woode]

Don't listen to these guy's who clearly don't know what they are talking about with headers being useless if you are going FI.

Aside from twin screw and centrifugal superchargers, there are several turbo kits as well that place the turbo further back in the exhaust (maintaining the header). In fact, for those types, you generally want to replace the factory catted header with a catless to ensure it doesn't break up and destroy your turbo. PTuning is the first that comes to mind, but there are at least 4-5 others.

There are also a few that offer headers that you can swap the "up pipe" from N/A to a turbo up-pipe. Probably slightly less efficient in N/A form, but you can still buy piece-by-piece this way.