Ok, so here it is... First off, let me say that the pacesetter ka24 header completely sucks. The fit and finish, the install, no hardware, etc... sometimes you just get what you pay for.
That said... I am very pleased with gains. Here's a graph mapping the gains from all three mods, and the AFR using the stock ECU.
Run 1 = Stock
Run 5 = 3" Blitz Realize exhaust
Run 9 = 3" exhaust and Pacesetter 4-1 header