you would think so… but 4" is as big as they get… unless you hack up the firewall and some other stuff.
Dan - 6k mod?
I was going to ask around in the 6.0 section of the forum for anyone who has upgraded their IC to Banks or something and grab one of those, or start calling the junk yards.
BTS Valve body will be tax return fun.
Injectors are probably more extreme than I want to go… until I get a full tranny build under her. Same goes for the snail and the propane. There is a guy who lives down the road from me with all that stuff and he is actually taking off the propane… I have to find out why 
Also… the shed I just built has plenty of room for some biodiesel production. I’m going to be looking into that for the spring as well… I don’t want to have to mess with additives this winter. You ever have problems in the winter? Use your block heater much?