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I have the AR headers and install took 4.5 hour and i am not mechanically inclined. Hardest part getting the driver rear plug in and out did it on jackstands. Make sure on the driver side there is a connector clipped to the fender well and if you don't move that connector you will melt it and throw a code saying bad O2 sensor. Don't ask how I know.
It took the FIL and I about 4 hours to get the LG's on. Toughest part was getting the car high enough on the jackstands, and the driver's side rear spark plug. Passenger side was a tight fit. Had to pry on the motor to get it in from the bottom
I luv my LG's. Took about 4 hours. Hardest part for me was getting the alignment brackets to line up. Drivers side was okay. Passenger side was a little tough. Excellent headers though. Good power gains. Havent had any experice with kooks or AR, but I heard they were also great choices.