I haven't looked at the exhaust yet cause I'm still deployed, but according to TH the exhaust comes with 12mm O2 sensors. PC says Autotune comes with 18mm sensors. What do I need to do to make this work? Do I need to weld in 18 mm bungs? Is there an 18mm to 12mm bung adapter I can purchase? TIA

 

I run a Thunderheader on my 03 RK that has factory 18 mm bungs up near the head. It's for a newer model than 2003 , but I don't know what year.
Thanks for your service
Eastcoast Jim

 

you will have to drill and weld in some 18 mm adapters. there are 18mm to 12mm adapters available but the o2 sensor will not be in the exhaust stream and will not give accurate readings.

 

If there is enough meat in the bungs , you may be able to drill them out to TDS and tap them for the 18 mm sensors.
Scott