will these work on my 2011 focus SE sedan?
Do you have any metrics around performance gains?
I'd love to buy them before the memorial day sale ends and save 30 bucks, but want to make sure they will work and will be worth the$$
already have CAI, 2.5" flex-back exhaust so I'm thinking this is the perfect next add-on, just like more details first.
2008 SE Sedan, Blue Flame
K&N CAI, 2.5" Magnaflow Flex-Back
Eibach Sport Springs / FRPP Struts