I have two b40 manifolds, one has trumpets and one does not.
Anybody got a link to nice write-up with some dyno plots showing how these stack up?
I am guessing one with trumpets possibly will have more torque, yes/no? It looks like BMW added these to the previous design?
Anybody got a link to nice write-up with some dyno plots showing how these stack up?
I am guessing one with trumpets possibly will have more torque, yes/no? It looks like BMW added these to the previous design?