i'm currently modding my MK6 zetec, at the min i'm working on the looks of the car. once these are finished I'm getting a manifold, exhaust system and air induction kit. after that i will be saving for an engine remap which i've had mechanics estimate me £300. but they are probably the best mods you can do for performance. if getting a manifold get the 4-2-1 manifold since this should improve the throttle response and acceleration. if you get the 4 into 1 manifold its going to be more top end performance. but like you i have the 1.4 so i'm looking for the acceleration. you can get a good manifold for about £100 - £130 then hopefully like me you know a few mates that are merchanics. hope this helps.