Oh us poor v6 guys.
In a slight attempt to be slightly helpful, I can only venture a few educated guesses.
Altering the runner length on my intake manifold, in particular, for a 4v aluminator, will destroy my low end but allow me to spin it up to 9000rpm, so my point is, I can alter the potential energy of the air in my intake system by lengthening or shortening components of it. It has and effect, whether the effect is positive or negative, is up to the application. I was experimenting a little during my engine swap, and running the car without the filter box made it run like junk. Return the spacer, and buy a couple books. A lot of engine building books and others like it will greatly improve your knowledge and make this hobby a lot more rewarding.