a V4 huh? that must be a new version of the zetec....
I dunno, i would say K&N drop in, kkm intake... probly the best stuff for cheap money. if you can make it look good enough, maybe you can scare people off, and no one will want to race you anyway! no, stick with the intake, and it will give u some speed, if u want to get into mig money, then go for exaust...