I initially did the same thing on my 2014 Roadster when i had that.
I installed a ramair system (later replaced with triple k&n filters just for the looks) added a decat crossover and installed TORs. The sound was SOOOO different with a far deeper rumble...real nice!
Did the same with my 2016 when i changed bikes but have since put the TORS in the box in my shed and installed a full Jardine header and can system.
If you want to retain the look of the stock headers, there are options from there on down. Paul Bryant (Viking Exhausts) who is a member here makes a crossover cat delete plus real nice cans that will look, fit and sound nice.
Check him out....he will be lurking close by....he is like a great white shark...mention exhausts and it's like blood in the water to him!
Many of our members have his systems and are pleased with his excellent work.
P.S..Check this guy out also....
new-used-triumph-parts on eBay
carandbikemanuals1066 on eBay