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Significant! I went from "tweaked" to the x-over (bridged plenum) style and it felt like the day I installed 178 pulley and DCAI. It pulls much harder with a hint of pissed off wildcat noise!......oh that sweet, sweet noise!!
I have "Rob's tune" from Inmotion, fwiw.
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NICE! So once again I'm going to have to tell my wife that "This is the last Mod. Honey, Honest". I've got the big mani's already; just need to send them to Rob for the x-over addition.