best begginer mods for my dodge?

hi was wondering what begginer mods are best for my 02 4.7 powertech dodge durango slt+. what would i expect from a exhuast/header combo and what are some good brands? im looking for more torque then hp and i do not wanna exchange my rear end gears and will platnium plugs and new coils do any diffrence? and just a question how much money would it be to have it put out about 350hp/400 torque with the current motor of course rebuilt and if i was to do the work. thanks and btw i would ask on a dodge fourm but most of them a azz's there.
also how much and how hard is it to install a h.o. manifold from a junk yard and can a cai be homemade? thanks
also she is 4wd with 3.55's
 
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