Good plan.
way oversized FMIC, chopped-up tin, jack-leg piping kit, blow-through MAF conversion on a MAF/ECM expecting draw-through, unknown tune. I'm pretty easy on people around here but, keeripes, there's so many ways this is going to struggle to work.
Agreed. For one thing, with 2.5" piping on either side of the FMIC, you have no scavenging effect. For another thing, if you're not big turbo, you have absolutely NO need whatsever for piping that large. 2" hot side, 2.25" cold side, max. That create scavenging and prevents additional unnecessary lag. Big FMIC? another no-no for non-big turbo. All it does is look good and add lag.