Did BMW Redesign the Seal on the Xover Pipe?

[crystalworks]

Title says it all. I am getting ready to tear into this beast in the next month or so and am accumulating all the parts necessary to do a "one time" surgery. Doing all the timing covers so will have the "opportunity" to do an OEM Xover pipe. So, has BMW updated the seals that were used or are they still garbage? I don't want to have to do another Xover pipe on this truck... and I intend to own it for a VERY long time. This is also why I am ordering everything from FCP.

I did search, but could not find anything. Googled it too... all references to Xover pipes led to one of the aftermarket solutions.

[crystalworks]

So far have only found an implication that BMW has NOT changed the seal on the pipe from an auto tech forum. Not exactly concrete.

I have found this MTC Xover pipe. MTC makes a collapsible pipe kit as well so maybe this seal HAS been redesigned.

MTC Coolant Pipe

Also, I was watching the AGA installation video of their Xover pipe. In it he mentions that to do the OE version of the pipe you have to remove the timing covers... which I'm fine with. But then he goes on to say that you have to remove the timing chain and sprockets??? Is that actually necessary? I certainly don't want to do that, and if that's the case I'll just get a collapsible kit. Anyone know if AGA's claim that the sprockets and chain have to come off are true?