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The car is only 6 months old so I suspect if there’s a mechanical problem, it occurred during the install. The header/op and drop in air filter are the only mods. I suspected it was an exhaust leak but double checked the torque on the bolts after a few days of driving/logging and they looked good. I was accidentally a little rough on the O2 sensor cables when removing the stock header (the cable was snagged in the engine bay and I didn’t realize) but there’s no visible damage so I don’t want to replace the sensors if my problem isn’t characteristic of a bad sensor/cable.
I haven’t seen any posts from anyone else that shows healthy fuel trims except for STFT under throttle so I’m at a loss. My best guess is that it’s a small leak somewhere that is so small it only leaks under throttle, but I’m hoping someone else has experienced something similar before I start blindly replacing parts. My next step will probably be having a mechanic leak test the intake/exhaust, then replacing O2 sensors if I don’t receive recommendations to try something else first.
Thanks!
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