Have a year old 5105 H and just picked up a slightly been used 7910 XD . There will be parts availability for at least a decade or so , I already have spares . 13 k Coils & Air filters , clutch drums etc would be a investment in the future . Same thing I did with my 2012 346 xp
Jeff, the 510 and 5100 use the same muffler.They are very simple inside and easy to modify without splitting the case. I cut the exhaust gill in about 15 minutes and getting ready to give it a coat of high temperature black paint.I just yesterday ordered a 510 non Cat muffler at this point that is all I really wanted I guess.