Exhaust system Question

[ismaelae86]

Well question is what exhaust set-up i should go with...my research has come up with mixed answers (on rx7club) so i figured i can just ask u guys...i was wondering if long primaries are better or short? here are the to set-ups i was thinking about. either the isc/mazdaspeed header and have the primaires abour 95" from ports and collected them in to a 3inch outlet inlet borla xr-1 sportmans muffler or dynamax ultra flo ss, and possilbe have a racing beat dual presilencer if its too loud. or have the SDJ header copy from mazdaspeed part# 0000-06-7406 3 inch back to some sort of middle muffler and out a borla xr-1 or dynamax ultraflo ss.. now i know the isc header is cheaper than the sdj but is there a big enough difference in power to offset the price difference?...and from what ive read long primaires have a better wide power band...so pretty much im stuck hahaha
thanks in advance for your help
ismael