The ATP kit is nice, I have one on my '02; but it is not exactly cheap either. I will be putting one on the '01, but only once I have the oil leaks taken care of. It seems that as soon as I fix one, another one pops up somewhere else... :{The 2nd gen HO models were the loudest the Cummins ever got. I know, I own one. And the hood blanket came off long ago. And I have a Smarty with increased timing which makes it louder.
Below is the link to "Advanced Thermal Products", a TDR website sponsor. They make a kit specifically for Dodge Ram Cummins trucks.
DodgeRam
Godspeed,
Trent
step 1 put in a big honkin stereo
step 2 insert favorite cd
step 3 turn volume up