I have a TuneECU for my '08 990 Adv even without an exhaust. The TuneECU is mainly to smooth out the fueling (not a prob on newer than '08). So if you have a newer bike save the money.
I'm really thinking of this Remus Roxx 2:1. Also contemplating a Q4 or Arrow too. I have no plans for tool tube or aux fuel tank. I've owned Q4 (xr650l) and a Remus (vfr800) on previous bikes. Loved both. I've read the Q4 may lose bottom end? Wondering if TuneECU would fatten the bottom end?
'12 DL650 Adventure; '08 KTM 990 Adv w/19" front Excel; '09 Sherco ST 2.9 trials; '03 KLX400SR