How can I make a stock Focus hatch faster

 

I am sorry , but I am very much tempted to type a smart mouth answer . But I will not .

Power is the product of air , compression , fuel , ignition and all must happen at the correct time in relation to the other .

That is if you mean faster acceleration .

If you mean top speed , throw in wind resistance ( or lack there of ) .

First , check all fluids and other " consumables " & make sure all systems are in tip top condition .

Now , cold air to the filter & intake .

Some engines can have the electronics / chip reprogrammed / replaced for increased power .

" Performance " exhaust system .

Report back with results .

God bless
Wyr