Haven't quite decided on what injectors yet, but I think I may upgrade the secondaries to 1600's with a Bosch 280 lph pump and definitely get a PFC. that with some sort of boost controller and I'll be good. It's a work in progress.
Are you thinking about those 1600cc low impedance Bosch injector? You'll need injector driver for those to run with PFC, I would recommend upgrading both rails and get all new EV14 injectors, they are high impedance so no driver and are much better injector in general.
1994 MX-6 RS -- RIP 1/30/2012
1996 MX-6 M-Edition-- Sold 4/14/2019
1993 RX-7 Grand Touring
2010 Mazda3 Hatch Grand Touring