I had to jack up the driverside of the motor to get those headers in. I also did poly motor mounts at the same time to help with clearance of the ORY once installed.
You dont need new O2 sensors, just extensions for the wiring harness. Plug and play wire extensions add 12" to the harness. You could also cut and splice the wires yourself if you feel comfortable soldering.
You can run the headers and ORY without a tune with no issue...I did it for 2 years and only a dash light stays on for the emissions. A tune will help with power gains but its up to you if its worth the money.
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1999 C5 FRC: 12.7@114
2008 TBSS: 12.48@108
2017 Silverado 2500 do you even lift breh?
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