I am about to change my lower intake put a new updated intake on and i am going to put a bbk plenum and t/b..I was thinking about the spacers I seen some people talk about them are they worth the money?
not really. my mac plenum sat just as high as the stocker.
being said, i do have the spacers(from mustangtuning, 30 bucks) and did them just for ****s and giggles, since i was taking the plenum off anyways.
just ask yourself this. how is adding 1/2 or 3/4" between the plenum and manifold going to give you power? its just farther for the air to travel. i can see if you have the kind that are supposed to "spin" the air as its coming in, but even then, once the spinning air hits the manifold any vortex is going to get torn apart by the intake pulses from the valves.
I had the Steeda Intake Spacer with my stock TB & Plenum and noticed no difference at all. I sold it when I got my Accufab TB & Plenum (it's already raised). I wouldn't waste my time.