i was told by the guy tuning my truck that if i relocate my egr hose out of my air inlet that the air let pressure and temp with be more consistent allowing me to fine tune my truck alot more??? has anyone heard of anything like this???

I know on the higher hp setups for the Cobras where they are running a lot of boost they usually remove the egr entirely so im sure it can help
but I don't know if there is much to gain on the 8lb f150 kit unless you are going to do a lot of modifications

if you try this technically the kit would not be smog legal which may not be a big deal depending on where you live

Here's something I found on another board that I think explains the EGR and it's functions pretty well.

There is a port on the headers that directs some of the exhaust back into the intake via the EGR valve (exhaust gas recirculation). EGR is only used at part throttle operation and not at idle or WOT. It cools the combustion chamber by slowing the burn times and subsequently requires more timing to get the slow mixture to burn. It also increases fuel mileage slightly and reduces emissions. Removal of the EGR system may be against the law in your state and usually requires a retune to reduce timing in these areas to avoid knock. Generally EGR is good and there are no performance gains to be had with its removal. Some people remove it to clean up the engine bay

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correct if he mods it or deletes the egr its no longer street legal.