The Scion xA is a cute little car, some of the add ons where done at the dealer, so we had to wait to add this and that. We got the cold air intake, you won't get the extra boost, but the engine runs smoother. I did not like the door stereo upgrade, for what they charge I expected better. I told them I wanted my money back, and they just laughed.
I like how it gets 32-36 mpg in city all the time and has such a smooth ride.
Don't pay for door upgrades, buy it yourself and get the dual speakers (good ones like infinity) in the back. The driver's seat should go back one more inch for us big and tall guys. Get rid of that stupid antenna on roof. Lighted cup holders should be standard). Cruise control needs to be on the right side.