This is a conversation between defendants Daniel Patrick Boyd and Anes Subasic recorded April 18, 2008.
According to the indictment, Boyd and Subasic hold "a coded conversation in which they discussed preparing to send two individuals overseas to engage in violent jihad." The FBI summary of this call can be seen here. The summary also explains why investigators believe the references to cars are part of the code, since a conversation between the two just a few minutes earlier included discussion of their concerns about FBI monitoring of their activities.
SUBASIC: "Since I don't know, you know, how good you know these individual cars."
BOYD: "I've been driving them for 20 years."
SUBASIC: "So, they are in good shape?"
BOYD: "Oh, Mashallah. Like a Porsche."
SUBASIC: "So, we don't need to fix anything on it."
BOYD: "Well, we will if they don't ... you know if you take and drive a Land Rover on the highway, it starts to break down. Beause Land Rover for the savannah and the mountains and off road. Like if you take a Porsche and ride it on the off road, it's gonna break it down because it's for the highway. So, nothing needs to be fixed, yet." SUBASIC: "Maybe different tires?"
BOYD: "Maybe. The point is, is that all of those superficial changes don't change what is inside the heart of that car. It is still a Porsche and this one is still a Land Rover." SUBASIC: "But they like to be drived fast. Drove fast?
BOYD: These cars? No, they like to drive according to the law. If it's fast then they will go fast. If it's slow, they will go slow. They want to follow the law. Obey all the speed limits, stop signs, everything. That's how they know, if they don't drive their car, it's going to become broken down. If you put a car in the garage for 20 years, believe me, it's worthless.
SUBASIC: But you think they are able, with such a speed, to drive to that distance and they are able to do so, their engines, what's your opinion?
BOYD: "One of them I will say I am, I, I am sure. The other one I am 95 percent sure." SUBASIC: "How old the cars?"
SUBASIC: "How old the cars are?"
BOYD: "20 years."