i have two pair that leak somebody told me you can send them back to berebuilt at CMI is this true has anyone done it thanks in advance

Search the threads. I think you will find that once they leak , they are junk. Can they be fixed , Yes. Will they last , probably not. My bud just went through that with trips in his hustler. 24g later , all new exhaust.

I've seen them repaired but I'd never do it. First, exhaust is way cheaper than motors and one of the leading causes of their demise. Plus, once repaired they have those ugly patches on the elbows. If you can deal with a few horses less, manifolds are much more reliable.