Welcome from (right now no so sunny) Spain.
Before spending too much cash - be aware you can get quite a boost from a "T" just by putting in a Roadster tune. If you want more - the exhaust headers are a major restriction. Just fitting open end cans won't make THAT MUCH of a difference. There are lots of headers available. All better than stock - but you need to balance aesthetics and maybe factors like heat shields. Most of the header guys offer end cans and it makes sense to get a full system.
Now that it breathes out OK - allow it also to breathe in. Again lots of options. The major question is whether you want to to look stock or not. Depending on things like your height and how you sit when riding - some of the solutions CAN be a little intrusive.
BUT - allow me a tiny interjection. Sort the suspension out first.
Yeah, The old fashioned spaghetti forks vs USD is a big compromise. Victory made a commitment to use USD on their big cruisers, and they feel GOOD.
That said, "a good craftsman never blames his tools"....
For instance, my 2007 Triumph Tiger 1050 has many aftermarket suspension upgrades available, many riders say you NEED to upgrade, stock is horrible. I can report that on the frost heaved roads of New England, the Smokey Mountains, and this past spring in Ireland/Scotland/Isle of Man, the long travelling, compliant OEM suspension supported VERY exhilarating
speeds (UK speed cams aside
).
I know on glass smooth roads at racetrack speeds, heavier springs & more damping would improve lap times.
So, I'll feel out the big T3R. Does anyone offer a TOP quality air suspension setup that isn't a "lay it on the asphalt" bling deal?