I had wraped my short shots 2 years ago. Now my pipes are rusted/ burnt out and I cant get the rear o2 sensor out due to the bung is spining. ? how much do o2 sensors cost and wheres the best place to go. I'm going to put my stock pipes on for now.

 

Don't know what bike you have but if they're the stock sensors you can get them from a dealer, list is around $44, but you can get them for under $30 at Zanotti's. Those O2 sensors will wear out after awhile so it can't hurt to get new ones.

 

for 30 to 45 bucks +1 on the new O2 sensors. Nice that for once they don't cost more. And yes they do go out eventually.