After a year of living with the Ixil SX-1, and travelling ~20 000 km with it, I have the following remarks:
- It hasn't deteriorated, corroded, broken in any way, the build quality is great. The header pipes have, obviously, discoloured and could use some polishing.
- I ride with the less-muffling db killer installed. The more aggressive db killer makes the bike sound too castrated and quiet, and riding without any db killer is tiring on long stints (and makes me feel like an asshole in the city). It's great that the kit contains two different inserts to choose from.
- Still love the sound and looks.
- Since it has a different shape than the original, you have to be more strict about keeping your chain tension within the limit - if the chain gets too loose, it WILL come in contact with the muffler faster than it would have with the original one.
- There is some slight burbling and popping when you go from no throttle to some throttle while the RPMs are going down. This is not obnoxious and it doesn't happen all the time. You can actually learn to control this effect and avoid it when you don't want it. AFAIK
there are no ill effects present on the engine, as maintained by the dealer. I'm mentioning this because on older gen Vs some people would do PAIR valve mods to avoid crackling in aftermarket exhausts - this doesn't apply in my case. Firstly, the popping only occurs in very specific circumstances and secondly, I looked at the airbox when the dealer took the tank off for maintenance and there was nothing that looked like the PAIR valve from the pics of older models.