[J.C.you]

Originally Posted by tpssonic

"realize this is the street section, but a cold intake under running conditions makes a case for runners to have this type texture."- J.C.you

Exactly! This "texture" promotes turbulence and additional atomizing/emulsifying of the charge. In dyno tests (again, 2-stroke engine-speak spoken here, but it should apply to similar internal combustion engines), we saw decrease in power FROM STOCK with (smooth-finish) extrude-honed intake ports. Roughen them up and bingo- increase in power from stock. More importantly, it helps both street and race engines.

another pic extended into the intake runners and chamber also. Meaux has done back to back tests, same engine, same heads/ intake package on the dyno. A average of 15HP was typical and he did not see one instance that power fell off with the mod. The ETs dropped respectively at the strip also.