I've been poking around found some parts that i'm thinking of investing in... just want to know if they're going to be worth the investment and are going to be and do everything they say they are...

first off is the ZZP voltage booster
ZZ Performance
^^ will it do everything they say it will?? and will it eff up anything???

next up im pretty torn between either ebay's speed_daddy's headers setup or do a simple 3" downpipe, because the essentially will cost the same. i just don't want make my car stupid loud, i just want to be able to here it when i get on it. also i'm lookin to boost up mpg's as well because of the amount of driving i do and i know headers are good for that, but will the downpipe get the same mpg's as the headers will... or would just a simple u-bend delete w. and o2 bung be suit enough???

i dunno let me know what you guys think???