My experience is that most titanium exhaust do develop cracks after a while due to the low fatique strength. The pounding of the exhaust pulse of the twin over time will cycle the material so it will develop cracks. Not so much with the inline 4. If you race and have lots of money titanium will do fine. If you want longevity go with stainless steel. My last titanium exhaust exploded on me on the backstraight of road atlanta on my 999. It shredded my rear tire as I came around turn 9. Not so much fun. All the 999 titanium mufflers developed stress cracks. That is just what you trade in for the weight savings. Since RA I prefer SS over Ti unless I have a factory ride.....
He brings up a good point; what level of stress will you be placing on the Ti system? The fatigue conversation is likely a moot point if your riding on the road or an occasional track day.
For what it's worth, I've had 3 Akra systems including a full Ti system on a race bike with zero issues. And I'd agree with some others that Akra sets the bar for quality control and customer service from my experience.
