Join Date: Apr 2017
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Yeah, it would be hard to believe an exhaust leak that bad would go unnoticed, but stranger things have happened. Just throwing it out there since it sounds like you are covering all of your bases. When I am troubleshooting issues and I've exhausted (no pun intended) everything I can think of, an old saying my grandfather would tell me comes to mind. "If you've looked in all the places it should be, start looking in the places it shouldn't be."
2006 F250 CCSB FX4 6 Speed Manual
KC Stage 1 Turbo, Spearco Intercooler, SCT X4 w/ Custom TSD Tunes, ARP Studs, EGR Delete, South Bend Dual Disc Clutch, AirDog II-4G Pump, AFE HD Momentum CAI, AFE CAC Pipes, AFE Intake Horn, AFE Front & Rear Dif Covers, Magnaflow 4" Turbo Back, EGR Delete, Sinister 200 Amp Alternator, Sinister Coolant Filter, BPD Radiator, BPD Water Pump, Big 3 Upgrade, Blue Spring, EDGE Insight CTS2, Morimoto BI-LED Projector Retrofit and LED Fog Lights, Bilstein 5100s