Raptor with Water in Exhaust Manifold & Cats

[rhouse181]

Had a couple lazy / open O2 sensor codes thrown this season on one bank, but no real degradation in performance and she never ran warm. Finally got a chance to drop the boat off at the dealer to get some new sensors under warranty, but received a surprise when they found water in the exhaust manifolds and cats.

Supposedly they replaced both right and left bank manifolds / cats... they mentioned it was an issue with the casts and an uncommon failure. So I'm surprised that both sides bit the dust at the same time.

Are the manifolds jacketed with raw water cooling or would the water intrusion have to come from upstream via the exhaust?

I'm suspicious that something wasn't winterized properly the previous season... and also curious what other gremlins were created by running a season with cracked manifolds.