I'm speaking with absolutely no first person experience but from what I understand the difference between the H and X is going to cost maybe 5hp tops above 5k rpm. If I'm not mistaken, the whole reasoning between the cross over is to even out the firing pulses so that the exhaust flows more...
I'm sure you could get a wetsuit for pretty cheap off ebay :joke: I sure do love living in AZ though. It's 66* right now. I went out this morning to put the trashcan on the curb in shorts and a t-shirt.
http://www.blackbearperformance.com/services.asp
That should answer most of your questions. I plan on going BB soon, I just want to do a couple of trans upgrades before I pull the trigger on 100% TM removal.
+1, I'd definitely look around the truck for other jerry-rigging and ghetto mods. It might not be worth fixing after all of the junk that' s potentially been done to it.