Mate of mine had his on aftermarket exhausts for years and didn't change the map. Only changed his map recently because I replaced his airbox and did all the other mods.
It's not hard to buy the Lonelec cable from eBay and use the free TuneECU software to upload a new map though.
I seriously implore you to go ride an SMT that's had the airbox replaced. I love this bike now. There are cheap ways of doing the mod (I did it for a couple of hundred all in).
Now: 2013 KTM 990 SMT
Old: 2010 Ducati Faultistrada 1200s (Broke)
Old: 2007 Yamaha R1 (Sold)
Old: 2009 KTM 990 SMR (Stolen)
Old: 2008 Ducati 848 (Written off... whilst parked
Old: 2007 ZX6R (Written off... elderly driver)
Old: 1996 ZX6R (Sold)