Thought I'd share my take on the adjustable FPR for the TBI crowd. You can buy one online that replaces the factory regulator, but they're like $70. There's also lots of variants of the homemade style online, and I'm sure someone has already done what I've done, but the writeup many refer to is on 3rd gen and with that one you have to take the injector pod off to adjust. All I did was drill out the cap on the bottom cup of the regulator, which exposes the screw assembly that will raise or lower the spring perch. (it's factory set at the lowest setting or close, which provides the least amount of pressure) I ended up drilling and tapping that assembly for a 10-32 screw and installing a matching SS thumbscrew. It screws in tight and will turn the spring perch easily without unscrewing itself, but I think I will epoxy in the thumb screw for added security. I'm going to start out with the factory spring to see what kind of pressure range I can get. @4WDKC gave me a link to a stiffer spring (thanks!), which I bought, but I think I'll be able to get what I need (~13 psi) out of the stock spring, since I'm using 454 injectors.