hey i have a 2007 grand prix gt with s1x, cam, oer lifters yella terra rockers, 105 springs and modded retainers, 3.5 pulley, headers 3" down pipe, plugs and t stat and intake ect, and hp tuners and well at about 5100 rpm i reach 100% injectors duty and 23ms pulse all the way to about 136% and 25-26ms at about 6000-6400 rpm. with about 6kr at the 5100+ range. so what i wana know is do i need new injectors or should i start looking at fuel pump and its gay filter in the tank for the 07 if new injectors what should i got with i plan on doing more mods down the road. thanks.

If you are planning on doing more then I'd skip 42lbs and go with 60's.

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1997 TGP

In a scan I ran with my 3.2 setup I saw about 130% duty cycle on my 04. However I am just now seeing a little bit of lean out on my wide band at the top of 2nd gear just before the shift. I don't trust the computer's "estimations" of duty cycle. Unless you're seeing lean out on a wide band O2 then you're good.

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Mods include-
Pulley boys 3.2 pulley, 20* timing, HPTuned, pacesetters, SSIC, modded 1.9's, F/R STBs on Don Rome brackets, 255lph pump, ZZP billet rails, GXP catback
Best of 13.4 at 103.... 12's this year