oft comes with everything you need tune device plus tunes no locks or liciences and oft works a a guage disply for things like oil temp knock etc and to can set alerts to sound
second hand oft sell rearly well for little loss
ecutek you need to buy licience350 plus tune about 250 if you get tuner to flash, if no ecutek tuner arround you need to buy cable to flash for anoyher 350 or so
ecutek you can only sell the cable as ecuteck licience and tunes are locked to car
tomei are probably better quality than openflash but will cost a bit more
jdl are good but probably dearer again
if you read the Basic Bolt on mods Giude below it will answer all your questions
just be wary of cheap ebay headers the fitment is somtimes not good and they may have cracking or corrosin problems.
http://openflashtablet.com/Automotiv...OFH/index.html
may be a good option if no local tuner available tune flash device and header for about $1000 as ling as you like uel sound