One problem related to manifold/header/muffler/tail pipe has been reported for the 2015 Jeep Wrangler. The most recently reported issues are listed below.
Oil cooler assembly has started leaking badly after 60,000 miles and is a fire hazard. This assembly is too fragile and requires taking off the intake manifold to access and replace, so it should not be a plastic part. It contains the oil filter which causes it to have torque applied every oil change and causes it to break prematurely. This is very common problem and I was told by the dealer that there were 25,000 of these assemblies on back order nationwide and he could not tell me when it would be in stock. My Jeep is now undriveable until the backlog is worked through which may take months. If this was a rare problem I could get the part and have it repaired. This problem has rendered my vehicle unusable. This is unacceptable and Jeep has known about this issue for years on multiple year models. Please investigate. There is no reason this couldn't have been properly engineered with a metal part.