I've tested requesting two stacks of an item in this chest with both an Mk1 and Mk2 pipe, and I noticed no difference. The tooltip for the Mk2 says it's faster than the Mk1, but I couldn't see it.

The Mk1 took about 13 seconds from requesting 2 stacks to the last batch of 8 items arriving, and the Mk2 took about the same. Both even brought it in batches of 8 items.

Might be a copy-paste bug in the language file, because other than having a logistics disk slot or being able to open its GUI without a wrench in the past, I cannot remember any other differences.