custom tune with no programmer?

[widj64]

Hello,

I have a 2006 F150 XLT 5.4, I don't know how to find what gear settings I have
I recently put a K&N air intake and Magnaflow exhaust

I'd like to know if it's possible just to "flash" the truck with a custom tune without having to buy the programmer

reason why I am asking is for few reasons:
leaving the programmer in the truck, someone will break in no time seeing it
$400.. well I don't really mind seeing real time the engine gauges

is it possible? how can I load a customer tune without a programmer?