When i put my new intake on I replaced the AFPR and put new orings and tips on my injectors (stockinjectors), I then set the fuel pressure at 40-41 vac off. the car feels ok but I'm getting some soot on the exhaust tips and bumper which seems worse than before. My old plugs were champion and showed lean white but car ran fine, now with autolights my plugs are good color but I wonder if I should turn FP down to 38#, guess what I'm askin is does 3-4 pounds difference really matter in terms of performance? Rest of fuel system is stock long block is stock with Typhoon upper lower.