I was looking at these FPRs and wonder which 1 should I get/will work on my car. http://www.magnumforceracing.com/mag...Control%20Unit.

 

If you are using the stock fuel rail setup and stock return line configuration, you need a fuel pressure regulator made specifically to fit in the end of the LT1 fuel rail. None of the ones you linked is LT1-specific. They also appear to be "bypass" type, and those are generally used with a "dead-end" system, like the one used on the LS1 F-Bodys. The LT1 has a full flow FPR on the return line, so there is no "bypass" required.

If you've altered your fuel rails and supply and return lines to braided S/S, with -AN fittings, you could use one of the "Fuel Injection" models... but they describe them as "bypass" type, and as noted, that's not the system used in the LT1. If you need something other than stock..... I can give you a link to a Weldon AFPR that will work in a full-flow "return" controller. I've run it with a total of 410 lph pump capacity, and 800HP off the rails with a 300-shot of dry nitrous.

The stocker's actually adequate up to about the 500HP level, then you need to start looking at something else. How far over 500HP are you?

 

People are going up into the 700 range with the stock fuel lines and regulator. Well at least us blower guys are..........

 

I thought if you bumped up your pressure the computer compicates

 

In general, it does, but that's not the question. There are times when it can be useful to run something other than the stock 43.5psi, and as long as you program the PCM (or aftermarket ECU) with the correct flow constants and offsets, you will be fine. I run 64# injectors at 58psi, to keep duty cycle under 70%, and to minimize flow changes in the injectors as a result of pressure variations.... e.g. pressure drop as a result of G-forces on launch.

You just don't want to attempt to "tune" the engine using an AFPR.

 

http://216.242.145.16/products/product.phtml?p=13

This is a link to an F-body LT1 specific adjustable regulator. It is available from a number of sponsoring vendors. Feel free to let me know if you have questions.