"...Do they reduce airflow?..." (from what?)
take a look at oem - less restriction than that, so "No".
My reason is "cooler air" (compressed). Not feedin frm over the mediumies" ("tubes") I'm puttin on. (The last set
of CI headers, as Matt drove in the back door to haul away the remaining CI inventory, Will shipped these out the frnt door).
The best trick (4 me) will B figerin out how ta go frm round (Matt's carb hat to match my VC) to rectangle (the fresh air tube on the bronk's grill) w/the hose, adaptors or whatever. So far Spectre can't help. Curse of the rest0modder - enuff prts sourcing...