No heat guard and I don't think the stock parts will fit as there is no mounting for them. That said, the carbon doesn't get nearly as hot as the stock metal silencers. Went for a ride with my girlfriend this past weekend with no issuses or complaints.
No worries... I wouldn't mind having another Arrow kit owner running around the forum... less questions for me to answer!
On the ecu issue... yeah, I also found it strange that the termis required a remap and filter while the Arrows do not. It may be a pure power and tuning thing, or... maybe it's a noise and emissions thing since the termis are a "Ducati approved" and offered kit? Either way, the termis are probably a great deal, but it's still more money. Also... I'm not sure how light the termis are, but I held both the Arrow and the stock muffler in each hand, and I'd guess this took AT LEAST 10 lbs. off the rearend. That's gotta be worth something, right?