I'm looking at the same thing now. I'n not 100% sure on much but i think plenum 1.5x is good. I've heard same size and twice as big, but I've noticed alot of hi-performance using what seams to be about 1.5. If any one can confirm or denie that'd be awesome!
With runner length longer equals more bottom end, shorter more top end. app. there's a web site, i think its 'bill's'?, that has a formular on it but i dont have the url sorry. If some one else does that'd be awesome!
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