Just got some stuff for my custom secondaries project, I'll be enlarging the secondaries 5" more, at the time they're about 13 and 11" and will be 16 and 18"
5" more is where the flex pipe starts, then I'll add the collector (2.5") choke and then 3" for the midpipe, want to keep the flex pipe at last.
Also I need a new flange for the secondaries and once I drop them in I'll be porting the primaries flange up.