Jacobs exhaust brake
I bought my off ebay (actually Henson Dodge dealer in Madisonville, tx. ) Paid about $630 plus tax and another 250 for installation at a local shop. Most dealers have them for 2nd gen 6 spds. You might even want to check the TDR classifieds for availability. I love mine; going down 6 percent grades in 5th, never touch the regular brakes.