No worries...it's both but really more the intake design itself. When you see it, you'll realize they BMW clearly designed it to be restrictive and difficult to modify. There have been a few discussions on this. I'll post the pics.
Originally Posted by jjsC6
I want to follow up to our earlier discussions. As I thought about this later in the day, I do think I took your original response out of context. I think what you were saying is that the intake manifold is the best source of easy hp and I took what you said to mean that the intake was the problem on the car.
I apologize if you and I were looking at it from two different angles.
I suspect that they designed the engine with certain goals in mind, then detuned it for the 550i/X 50i. It's easy to do if you cut back boost and limit airflow. That's why Dinan was able to get back an easy 95 hp by cranking up the boost. Beyond increased boost, the next limiting factor is going to be airflow...on the intake and exhaust side (esp downpipes). We will see what the tuners can come up with.
2011 Nissan GTR Red/black - HP Logic tune/midpipe - "Lightning"
2012 BMW X5 50i M-sport Dinan S1 Space gray/black - "Thunder"
2012 BMW 550i M-sport Jet black/black - "Black Cloud"
Gone but not forgotten: '12 X5M, '07 AM SuperVantage, '05 Boxster S, '01 BMW M3,...