If turbocharging a 2003 Honda Pilot is doable?

If so do you know how much it would cost to do it?

Almost anything is possible, but if you have to ask, you probably can't afford it. So many things that have to be considered. Changing the compression ratios, fuel injection system, engine management computer. Then you get all that extra power, and the engine either self destructs, or chews up the transmission.

If your vehicle is too slow, the simpler option is almost always to sell it and buy something faster.