I spoke with IP&D today, and they too have the sensor bungs in the exhaust, so you must re-install all sensors, but they stay connected to the OEM harness on the frame rail. They explained they are basically there just for looks, so the exhaust looks like it has all the necessary sensors. The box does infact hook up to the ecm underhood. I was quoted the same $2495. 00. Hopefully we can get some feedback soon, as they said they average 40 orders a day, and they are 3-4 weeks out. I am on the list as of now. Oo.