Check the exhaust manifolds and their bolts/mounting during every service.
A characteristic sound is a "ticking" when starting cold, which disappears after about two minutes.
It's a common problem that these leaks and bolts break due to warping of the manifolds.
Repairs without replacing the manifolds with a surface-treated one are pointless and will have to be redone in no time. Therefore, always use a surface-treated manifold (left or right).
Use original bolts, studs, and gaskets—that way you only have to do it once!
