Just finished wrapping and putting on mine. Its a 4-2-1 though. Its composed of the Mazworx VE flange, 2" piping and I believe the first merge was 18" and second merge is 30" from the head. Im also in the same boat as you, similar mods, made 193whp. Now with the new header Im off to rent the dyno nor this week or next. Aiming for 205ish