You should be able to visually tell if they are the upgraded plastic front crossover pipe by if they have the problematic seam or not as shown in post #3 of this thread. The upgraded ones do not have the seam

 

Yep, thankfully I have the upgraded plastic ones now.

 

Thanks!

 

FYI. The updated plastic ones are still prone to failure. My 2019 with the updated pipes just went out, going with the OEM upgraded aluminum ones. 89k miles

 

Good info. Still substantially more mileage than the early 2 pieces failed at. What condition was the rear crossover pipe in?

 

Still tearing it down, but the rear so far looks alright. I'm replacing it with one of the aftermarket aluminum ones though.
Took it apart, cleaned, loctited & torqued the screws evenly. Going to use an OEM sensor as well. Initial pressure testing shows no air leaks.. so far so good.

 

Im changing the valves covers on my 2016 LR4 with the SCV6 (same engine) at 117k miles. I replaced my cross overs around 75k miles when they started leaking with the upgraded single molded design for the fronts, but still 2-piece design for the rear. After 40k miles they still both looked brand new. Im replacing the front with aluminum all the same.

 

Just posting to see if there's any updates on how often the one piece plastic fails.

 

Considering the labor involved it would not be wise to replace the parts with plastic ones when aluminum is available.

 

Oh yeah of course. I’m just wondering if in general they last a while on something like a 2020 with 80k miles.