Quote:
Originally Posted by projectRDM
What a whole thread of fail.
Backpressure is something some fool made up 60 years ago and people still swear by it. An engine does NOT need backpressure, period. You want to get all the exhaust air out as quick as possible to avoid creating backpressure, which chokes down the engine. A very small amount of lowend torque is lost due to the added flow, but it's hardly noticeable even on paper. There has been TONS of dyno graphs shown for nearly 20 years proving that the bigger the exhaust you have on a KA, the more power you make. Done.
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True... However like you said you want as much flow as possible. At a certain point, to much space available will create less flow. Basically, you want to find a happy medium in diameter(based on power, exhuast flow, ect) that will allow a higher rate of flow. In a smaller diameter, your exhaust will be traveling faster. Too small it restricts, too large, exhaust flow slows down as well. This concept changes slightly under boost. NA, you need smaller piping for lower end power, up top however, you wont suffer loss, in fact you will probally see small gains.