Plenum spacers......excuse my lack of knowledge but what are they, what do they do for poerformance and how do they do it? Also who make them, where can I buy them (bigphil per chance? ) and how much.
At a guess I would say its some sort of device to effectively increase the capacity of the inlet manifold? But thats just guess work, it took me a weekto realise a pop charger was just a fancy name for an induction kit