Originally Posted by BMRLVR
Not a lot of headroom is required to achieve full flow characteristics of the stacks due to the nice smooth bell mouth opening that funnels and directs the airflow.
FMU are not dummies....... They have been in the VW/Audi scene for many years now and although I am not a fan of how they like to slam every car they turn out, their past projects speak for themselves. It takes considerable R&D to engineer and produce a piece like this.
Your talk of camshafts sounds like a person who had replied to this post in a few replies above
I don't think there was ever a question of velocity stack length and relation to the camshafts.