Originally Posted by Zx3_Chris
getting my focus st st2 pb this april
i was thinking about ordering the fswerks exhaust and cai and having ford put them on when i get it.my ?'s are this if i have ford install them do u think it will void my warrenty. and second one is them two upgrades how bad do you think it would hurt the gas mileage thanks.
I don't think a Ford dealership will be too keen on installing aftermarket parts, and they're definitely the most expensive place to get it done. I would recommend asking around on whatever regional forum you belong to and asking for recommendations from other members on where to get it done locally. And it will most likely void the warranty too.
As far as gas mileage, it will most likely have very little impact. Some people even see gains in gas mileage with a cold air intake.