I'm lookin at doing the hx40 swap next. truck is used for daily driving mostly. On the weekends I pull a 24' trailer full of quads. Trans is good for 500hp. Anyone see any problems with doing this, or have any advice on this? I know I need to change the downpipe. Any other big things? How with this thing spool. I also have DDP 75 hp injectors, which are in the truck, just not in my sig

 

look into doing a 04.5 and up HE351, I just got one and once I gather up the other bits I need I'll have it installed
HE 351 is susposed to be better than an HX 40 (from what I've read)
http://www.cumminsforum.com/forum/98...econd-gen.html