Had my own 2005 "R3 Tourer" for a year & a half. Absolutely LOVED the power of the 3 cylinder beast.
It had the Corbin hardbags, Triumph w/s, boards, backrest & rack, engine crash bars. Added Valkyrie handlebars & Rivco risers along with the obliglitory louder car horns. It had 3 different exhausts on it, stock which was whisper quiet. I ditched the stock cat box which is empty on '05s & made my own 2 1/2" stainless glasspack 3 into 1 exhaust. I think you can see it in this pic. It was VERY raspy & got louder as the miles piled up. Also the heat started to tarnish the SS glasspack.

Got a screaming deal on a used set of 3 into 2 D&D exhaust from a fellow R3owners.com member. Much better than my homemade set up both in sound & looks. It was loud when you got on it, you knew you had a real 3 cylinder beast under you! They look similar to the stockers but shorter & RH side only, no LH muffler. I recommend them.
I believe the R3T can easily be "retuned" to the higher HP settings & I'm sure the aftermarket will come up with a cool hi-perf set of pipes if they haven't already. I like the looks of the R3T but I wish they would have kept the dual headlamp set up of the R3. Maybe in a few years I'll get another R3. Mine is back overseas with it's new owner in Portugal.
Ride an R3 for some distance before you decide. Not as smooth as a Valk but it will whoop the Valk in any measure of performance. That's for sure!