Parallel fuel rails advice please
 

Chaps, few questions please

What's the benefit of these ? - thinking of them for mine running circa 400bhp spec as in my scoob.
Will I have top feed or side feed as standard on MY04 Sti Type UK ?
Will they fit ok with PE 650 injectors ?
Does the car need remapping after fitting ?

Can anyone link me to an off the shelf package, maybe perrin or the like - don't want to send mine away for modding..

Sorry for all the questions !

Many thanks :)

Pete