Im running 30's and they are just fine. You will need a custom chip though. I bought the 30's because I plan to squeeze a few horses later.
MM&FF says that you can never go too big with an injector. Im not sure if thats true but thats what they printed. Though if you use the Mustang Analyzer on this site it will tell you that with 30's you are over injected.
But Im running them and they are working fine for me. BTW I killed another LS1 tonight on the freeway. He was really sore about it too. 
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98 GT manual trans, Magna Flow exh.
old car: 95GT, TFS T.W. heads, Holley Intake, B303 cam, FRPP 30lb injectors, Scorpion 1.6 rollers, 65mm TB, 73mm MAF, BBK Longtubes, Flowmaster cat back, March Pulleys, MSD coil, 9mm wires, Tremec 3550 trans, Pro5.0 shifter,10.5 Motorsport clutch, FMS aluminum driveshaft, weld in subframe connectors. 190lph pump, BBK adj FPR.
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