Question, I bought an OBX header from someone on Craigslist for only $30 but the problem is that it has alot of rust on it. Will this be be a problem for performance? I was thinking about sanding it all down and then sending it out to be hot coated. Is there any way to blow out the inside to make sure the runners are smooth and not rusty?

 

Not worth the effort to try to clean the inside