Hours later, the trucks come to a stop in a desert-like area in Mexico, and it is already dark.  The vehicles get unloaded, and Gisele instructs everyone to activate and sync their GPS units.  Dom asks where Fenix is and is told that he will meet with them later.  Giselementions a few details about how there is no room for error, and that due to certain measures that the border patrol takes (particularly their heat-sensing equipment), they will have a very small window. Their cars get loaded up, and everyone begins to drive.  In the dark, Fenix's car shows up and leads the pack, and everyone is instructed to follow him.  Dom pulls out of the line and tries to catch up, but a small opening in a mountain in front of them forces him to get back in line.  Right as they get inside, the border patrol helicopter just barely gets there and sees nobody. They begin driving through tunnels dug into the mountain, following Fenix's every move.  It is very confusing, as the path goes left and right with other paths to choose from.

At the end of the tunnel, they pull out on U.S. soil and are instructed to get out of their cars.  Surrounded by other vehicles and a black Hummer H1, Dom unscrews one of his nitrous tanks and pushes his car cigarette lighter in before getting out.  Fenix gets out of his car and chastises the drivers, making remarks about how sloppy their driving was.  The goods carried are then unloaded into the Hummer.  Guns are pulled out, though Dom isn't phased.  He catches the attention of Fenix by making random remarks, particularly about the specific car modification that his car had.  Upset, Fenix asks Dom if he had looked under his hood, but Dom begins to mention Letty and her car and if it sounded familiar.  Fenix recalls, but mentions that he doesn't remember what she looks like, but he remembers her dying. Images of what happened are shown, as Letty is revealed to have been in the exact same position, being a chosen driver for Braga.  However, the previous drivers were all shot, though Letty managed to escape, and Fenix hunted her down to L.A. and killed her.  Knowing the timing of his car's lighter, it pops out and ignites with the gas within his car (which is one of the few fallacies, since nitrous oxide is a non-flammable gas), everyone hits the ground after his Chevelle explodes, along with the cars next to it from the fire damage.  Fights break out, but Brian attacks one of the gunmen, takes his weapon and shoots many of Braga's men.  Dom gets shot in the upper part of his shoulder by one of Braga's men, who he beats up pretty bad, despite the bullet wound.  Brian takes over the Hummer and gets Dom to get in the truck as they drive off.

They eventually stop under a freeway and notice that they have millions of dollars' worth of drugs.  Brian calls Penning to let him know what happened (without giving him too many details) then stashes the Hummer in an impound lot using his FBI badge, figuring it would be safe there since Braga wouldn't think to look there.  Walking away, Brian says that Dom now owes him a ten-second car since his GT-R was destroyed, but Dom sees a new but modified Subaru Impreza WRX STI in the impound lot and breaks into it, saying that they're even.

Brian gets Mia and takes her to where he and Dom are hiding out to help take care of his bullet wound.  Things seem to be happier, as the three of them are together and having a makeshift dinner and praying together, reminiscent of the barbecue that they had in the first movie.  Brian and Mia are later sitting together, and Brian comes to realize why he let Dom go.  He mentioned how he admired Dom's code of ethics but also that he was trying to figure out his own code as well. In another room, Dom is looking through a box of Letty's belongings from earlier in the movie, and he finds her cell phone in an evidence envelope.  He turns it on and calls the last number dialed, but Brian's phone goes off, which Dom notices.  Brian looks at his phone, which reads "Letty," and realizes that Dom has Letty's phone and has realized that he was in contact with her.  Brian gets up to explain, but Dom is enraged and is upset, asking when Brian was going to tell him that he had been using her.  Without giving him a chance to speak, he throws Brian around and begins hitting him.  Brian tries to fight back, but gets overpowered by Dom.  Right before Dom resumed hitting him, Brian yells out, "She did it for you!"  Dom pauses, and Brian reveals that Letty had come to him and was infiltrating Braga's circle to bring him down and clear Dom's name to allow him to return.  Dom begins to feel remorseful, realizing that him leaving Letty to flee from authorities only made her return to L.A. and involve herself in dangerous situations to bring him back to her, hence her always working on his Charger while showing up on the FBI's screen as a deceased associate for infiltration.  Brian apologizes as Dom walks away.

The following day, Brian walks into the FBI office, only to find out that they are getting shut down because they have not taken Braga down.  He informs Penning of having Braga's most recent delivery, valued at $60 million.  Brian has a plan of luring Braga himself to exchange the drugs and apprehend him in the transaction, but in exchange for exonerating Dom.  Penning agrees.

Dom calls Gisele's phone, and she says she is glad to hear from him but wished that it were under different circumstances.  Dom mentions that he wasn't too happy about almost getting killed, though Gisele mentions that it's just business.  Brian takes the phone and asks to speak to Campos, and they demand that they get $6 million delivered by Braga himself in exchange for his drugs.  Campos refuses, but Brian says that either he can deal with Braga or Campos himself can deal with Braga for the loss of $60 million in drugs, so Campos agrees.

Brian and Dom are waiting under a freeway under construction while FBI agents are hiding in storage containers, ready for a full breach, though they are waiting for Brian's signal, as the whole area is under video surveillance, watched by Agent Ben.  Braga's men show up in several cars, and Fenix darts out and begins mouthing off, though Campos holds him back and apologizes.  Brian opens the cases with the drugs (though they are now empty) and asks for Braga before giving them their drugs, and Campos says that he is a man of his word and signals his men.  From an SUV, an older man in a suit comes out with a bag, drops it in front of Brian, and tells him that there is $2 million in it, and that the rest would be given to them once they receive their product.  Brian notices the old man's pink tie and asks if he was wearing pink the other night too, though he pauses.

Meanwhile, at the FBI offices, Braga's prints get matched with an agency overseas.  Agent Sophie runs into the office and makes a phone call to Agent Ben, saying that the prints have been identified and that she is just waiting for the printout of Braga.  Agent Ben is already convinced, and instructs the FBI agents to intercept, despite other agents in surveillance saying that Brian had not yet signaled them.  Brian is already suspicious of the old man, and in the FBI offices, Agent Sophie sees the printout and realizes that Campos is actually Braga.  She contacts Agent Ben again, but it is already too late, as the agents storm in immediately.  Brian yells to Dom saying that Campos is Braga, though he is already with Fenix in his Torino, and he instructs him to run them over.  Gisele is next to Dom as the car is racing toward them, but he grabs her and pulls her out of the way, saving her, which surprises her.  They get into the STI and drive away.

Back at the FBI offices, Brian is reprimanded for what happened (despite Agent Ben jumping the gun) and gets suspended.  Later, Dom is in his garage working on his Charger.  Brian gets there and makes a few remarks, particularly about praising Dom switching to electronic fuel injection, which humors Dom as he murmurs, "The buster's a gearhead."  Dom says he's going after Braga and his men, but also mentions how he's not bringing anyone back, meaning he plans on exacting revenge.  Brian tells Dom that he's going with him to find Braga.  He helps Dom a bit with the car, but sees Mia get home with groceries.  She glances at him and hurries away.  He stops and follows her inside, and turns her around to see her tearing up, and then they kiss.  Later in the evening, Dom parts ways with her as he and Brian head to the border, where in the morning, they meet with Gisele, who gives Dom a piece of paper with information of how to get Braga, which she says in exchange for him saving her life.

At a Catholic church, Braga (who we originally knew as Campos) hands a priest a bag (presumably full of cash), which in Spanish he says is "To get us into Heaven."  The priest absolves Braga of his sins while his men wait outside, and the priest walks away as Braga prays. Brian and Dom appear and hold Braga at gunpoint.  He eggs them on and tells Dom that he isn't a hero, which Dom admits but also says that that is why he is letting Brian take Braga into custody. He looks at Brian and says that he's going after Fenix.  They get into their cars and drive away, while Braga says that they'll get a few miles before getting caught, if they're lucky.  Braga's men outside the church are getting suspicious because of how long it's taking, so they go inside and realize what has happened, so numerous men who work for Braga are called and are now on the chase, going after Brian and Dom.  All of a sudden roughly twenty cars are chasing after them.  Some begin shooting at the STI, though Fenix rams that car and radios to the others to not shoot the car carrying Braga.  They end up going over the same path where their drug run was, fighting off cars in the process.  Braga asks Brian (who is ahead of Dom) if he knows where he's going, and successfully breaks through the doorway into the cave, which is hard to see.  However, he gets confused by the different routes to take and eventually gets split up from Dom as both of them are getting nudged from behind.  Fenix ends up chasing Brian, and Dom is getting chased by other cars.  Other vehicles end up crashing in the paths, though clearly Brian is going through the wrong path but ends up breaking through the outside of the mountain wall, though the car gets damaged pretty badly and rolls over a few times.  Brian is unconscious, but Braga is yelling for help, since he is still handcuffed.  Fenix is right behind them and gets out of his car to get Braga.

Inside the mountain, Dom is still getting chased, but as he is side-by-side with another car, he realizes that his car is on the wrong side and will crash into the wall, so he forces his way into the car directly next to him and pushes the driver out of the car while his Charger crashes.  Outside the mountain, Fenix pulls Braga out, but Brian regains consciousness and pulls himself out of the upside-down STI.  Fenix roughs him up and pulls out his gun, ready to shoot him. However, Dom breaks out of the mountain in the car that he "commandeered," and as Fenix faces him and opens fire, Dom downshifts and pops a wheelie and is driving toward him.  Brian grabs Fenix's leg, preventing him from running away, and Dom smashes Fenix into the STI, killing him, and leaving him dead and laying on the car's hood. Dom gets out to help Brian, who is injured but will be okay.  Brian jokes around, saying that he is the faster between the two of them when driving fairly and not dirty.  He tells Dom to run, but Dom said that he's done running as the authorities get to the scene.

Next, Dom is in an L.A. County jail jumpsuit in a courtroom.  Brian is with Mia, watching the case.  The judge decides that while he acknowledges "FBI Agent Brian O'Conner's" plea of letting Dom go for helping them take down Braga, he says that one good deed doesn't erase a lot of bad ones.  Upset, Brian storms out of the courtroom as the judge sentences Dom to 25 years to life, to be served in Lompoc, the same correctional facility Dom claimed to have done time in the first movie.

The last scene is of the bus of inmates containing Dom driving to the correctional facility.  Three cars show up, one of which is Mia driving her Acura NSX (seen parked earlier in the movie), Brian driving Dom's repaired Charger and Dom's two associates from the Dominican Republic driving an older Trans Am, still arguing with each other.  They pull ahead of the bus as the inmates are confused and look out of their windows, though Dom continues to look forward.  He hears the cars' engines rev and smiles, knowing that it is his friends who are coming to his rescue... the end.

 

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