Need a quick answer

[AzCivic]

Originally posted by GT40FIED
I've answered your question by telling you it's irrelevent. And velocity, while helpful in small amounts, is detrimental in excessive amounts. Perhaps you just overlooked the last post. You know...where I explained why you were misinformed.

holy crap its obvious you have no freakin clue.

take an engine
-you want air in and out as fast as possible
-for it to get in and out quickly it has to have good velocity
-at low rpms the exhaust should be small in diameter to allow good velocity at low engine speeds(your precious back pressure)
-at high rpms there's more exhaust gasses so the diameter should be bigger to keep from having the gasses back up(what some idiots(including you and v8) think is back pressure)

you cant do both so you make a comprimise between sizes.

BUT ITS ALL ABOUT VELOCITY, now go read up, and take what you learn to show and tell and let all the other future midas workers in on the info.