Genetic after all he is an elff 

Carbon
This is what is occurring in my hips
http://www.hipfai.com/If you look in the box labelled MIXED, that is what I had in the right hip and my left hip has what is in the box labelled CAM.
If you look at the type of athletes who tend to get affected by this, I have been a soccer player, Lacrosse Player and Martial Artist.
So it's a combination of my bones just growing wrong and all the activity. I stopped playing soccer and doing martial arts due to this.
I had an FAO in December to fix the right hip. Somehow the Cartilage is damaged again and we are trying to figure out why. I am hoping this will be an easy fix, I can continue with my exercise and weight loss and then get the Left hip done over the winter.
Then, if all goes well, after ANOTHER HALF YEAR OF RECOVERY, maybe, just maybe, I can get back to being the Athlete I used to be.
ChopTop
Any Good Muffler shop can weld the 2.0 Exhaust to the 2.4 Exhaust, anywhere along the straight pipe. Like you said, you just need a second opening for the driver side exhaust tip.