Sorry to post this in the Discovery section but really need the help..

My friends 2000 RR has this vacuum line missing. I know on our DII that line goes into the brake booster but searching his engine bay at night with a small flashlight didn't help... i searched rave and didn't find anything.

 

That is his PCV line.
He has the same engine as you, so park them side by side and compair breasts...I mean engines.

 

Spike i compared breasts and like always ones bigger than the other....i mean..

Anyway... I did check them out and it turns out that his has a plug that looks stock. That line is the brake servo line on DII's but on the RR I don't think it serves that same function. They don't have a similar brake booster like we do...

He hasn't been running premium fuel for the last year of ownership and had cylinder misfire on 3,5 & 7 according to my scangauge. We seafoamed it yesterday and cleaned the throttle and his check engine light hasn't return yet. He says it idles smoother. This is the RR brake booster/ABS modulator unit.