Purchased a used 2016 T120, it came with Vance & Hines peashooters and an X-pipe. The bike was running way to rich, decel popping all the time. The air cleaner was OEM paper and sort of melted and fused together. When 10,000 miles rolled around no service light came on, so combined with the black residue in the tail pipe lead me to believe someone messed with the ECU. Tried a plug made matters worse, tried non blended gas 89 octane which helped some.
I have made the following changes, K&N air filter (pulled the snorkel for good measure), this complete system and a DNK tune. Removing the OEM pipes and the aftermarket x-pipe was a real pain. In my opinion, skip the x-pipe go with this complete system. Installation really was really easy but without instructions where to start go with the chain side header pipe and work it out from there. Just snug up the header nuts until finished with the muffler.
The Vance & Hines mufflers had the baffles were removed by prior owner. It was loud, tinny and cheap sounding a bit embarrassing. This GP system fixed the sound, now a mellow deep exhaust note is emitted at idle up to about 2500 RPM. After that the mellow sounds are replaced by a screaming "let's get it done" attitude. It perfect, either by design or accident, who cares?
The DNK tune fixed almost all of the decel popping and added more power which is surprising considering the V & H decat combo which was removed.
This was a great purchase one you'll never…