2012 lift question
You should be fine without them. But, they are a cheap solution for piece of mind. With the 2.5" your front driveshaft shouldn't contact the exhaust, even at full flex. I put on the 2.5" coil lift on mine and I put on the spacers.
depends on whether or not you got the kit with shock extensions, new shocks that are made for a 2012 or aftermarket longer shocks. shock length will make all the difference in whether or not you will need to address your exhaust as if you have too much droop, your drive shaft will come into contact with the cross over. if you have the latter, you will most likely need spacers. if you got the 2 prior solutions, you will be fine.


