[scarceller]

After reading this great thread I see that Porsche introduced these restrictors in the 964 (early 90s).

I'm wondering if the engine had anything else changed at the time that the restrictors where introduced?

For example: did the oil pump change significantly at the same time? Or anything else oil related?

The reason I'm curious about these questions is to be sure that I don't put these restrictors into a 84-89 3.2L that does not have all the required factory mods that go along with the restrictors.