So my time has come to address the exhaust manifolds (headers). I'm considering installing it with my dad's help as a project, but I'm getting quotes since I've been strapped for time lately and it may be worth having someone else do it. The person who diagnosed the issue refused to install anything other than OEM because he's concerned other brands won't pass inspection, and he doesn't want to be held liable (he's had a bad experience before). I can understand that. I then called another local installer asking for a quote to do the labor for Fabspeed, and he immediately says he won't install those. Says there's fitment issues enough times that he's not comfortable dealing with them. However, advises he can install Capristo or Tubi. Both great brands obviously. I'm waiting on a quote to see what that will run me. Is there something us DIY people don't know about the other brands. Headers are pretty straight forward, I can't imagine that with so many others being installed there can be enough issues that an installer would avoid certain brands. Much less once that appears to be popular for the F430. Any thoughts?