Seems i got a drop in converter efficiency in B1S2. I do have a magnaflow hi-fo cat installed a few months back when i had the pacesetter headers installed but just recently this DTC came on. i currently have it as No-Reporting in the PowrTuner, but was wondering if its a cause of concern, seeing that its the Post-Cat and not the Pre-Cat.

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9”Cone Filter/4”FWI/LQ4 MAF/Ported 99TB/Ported M90/3.1” MPS/VS Cam/Pacesetter Headers/2.5”Catback w/MagnaFlow Cat/PowrTuner/AFC 2.2/Timing Commander/Devils Own Progressive Controller w/M2 Nozzle/LS1M Scanner/ZZP Stage 1 Fuel Pump Rewire/PRJ FP/42.5# Injectors
Looking for 12s passes

Not to worry. Setting that code to no reporting is fine, when you have a hi-flow cat.

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04 Indy SS build #972
XP, TOG's, Lightning injectors, 2.8 pulley, 105 CC springs, Wizaired, 3.29 gears, tripleedgeperformance ported blower, machined LIM, 180* tstat, RS12YC@.053, FP rewire, Alt rewire, stage 1 V boost, PRJ wires, Stage 2 IC

thanks for the info

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9”Cone Filter/4”FWI/LQ4 MAF/Ported 99TB/Ported M90/3.1” MPS/VS Cam/Pacesetter Headers/2.5”Catback w/MagnaFlow Cat/PowrTuner/AFC 2.2/Timing Commander/Devils Own Progressive Controller w/M2 Nozzle/LS1M Scanner/ZZP Stage 1 Fuel Pump Rewire/PRJ FP/42.5# Injectors
Looking for 12s passes

Yeah, I wouldn't worry about it. I have a magnaflow high flow cat and never got this code. But if I did, I wouldn't worry. Many people totally get rid of their after cat O2 since it doesn't do a thing but put up those stupid lights from time to time.

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1997 GTP - 200k+ miles, PEMs, 3" SS Exhaust w/ Borla Mufflers, 3.4", 180* stat(summer), FWI, 1.84 RR, PT, SLP hood, KYB GR2s, GMPP Handling Kit, etc...