...IMHO, no. The bike will be fine. That's where particularly FI bikes are better than carb'd bikes, elevation.
All the mods to airbox, exhaust, and fuel add up to a peppier bike, but not
huge gain in horsie-power.
My bike has all that stuff done to it by the PO, and yes, it's much more responsive than my bud's bone stock WR.
Very snappy=funner to ride, but mods=ca$h.
As a note, I removed the Yosh RS2 loud pipe and installed the stocker. It's just as fun to ride.
I'd concentrate on stuff you really need first. Handguards, skidplates, heated grips and such.
Maybe a K&N air filter. A larger rear sprocket helps alot offroad.
Most value's mod, again in my opinion, is a bigger gas tank.
Take the fuel programmer bucks and buy yourself an IMS 3 gallon.
You'll have funner longer.