Which exhaust brake would you recommend

The PacBrake kit does include a 12 volt air compressor. As I recall I paid about $1200 for the kit and my son and I installed it ourselves in about a day. This was money and time well spent if ou are going to be towing in mountains or over hilly country.

I also installed a set of air horns at the same time since I had air available. You also get a kit to mount an air coupling o you truck to inflate tires, beach balls, air mattresses, etc. This also came in handy.