How about that Charger flip over the Supra at the end of the first movie. That was pretty damn cool. Especially Dom's line after he gets out of the car. Also doubles as a funny moment considering.
Dom: That's not what I had in mind.
The truck driver who successfully fights off the gang with a shotgun during the climax. We never even see his face, but he's quite the memorable guy.
2 Fast 2 Furious
The prelude that was included on the DVD, which shows how Brian ended up in Miami and how he got the Skyline.
The bridge jump the Skyline does during the first race. Word of God says that after the Skyline made this jump, they simply had to replace the wheels and other minor parts and it was still in good running condition.
Brian showing his Nerves of Steel when he's racing for the American muscle cars by playing chicken with Korpi (Aka "Fonzie") so he can win the race due to Korpi having a massive headstart and Korpi ends up stalling his car in the dirt. By the time that he can get back on the road, Brian's easily caught up with no problem and wins.
The epic scramble towards the end of the second movie - first the big pickups are sent out to plow the cop cars out of the way, then about a hundred or so cars shoot out of the garage, causing mass confusion.
Fast and Furious: Tokyo Drift
The battle of East and West at the end of Tokyo Drift — Sean's Mustang (with the engine of Han's Silvia) vs. DK's Fairlady on a mountain DK is apparently master of (it was said that he is the only person capable of going down in one piece.)
Fast and Furious (Aka Fast & Furious 4)
Dom bursting out of the cave and plowing into Fenix, with Brian holding him so he can't escape.
The epic fight between Dom and Hobbs in part 5
The vault car chase in part 5, simply mind-blowing.
Dom and Hobbs teaming up in part 5. When Dom is giving his big "You can do what you want, and I won't think less of you, but I have to do this" speech, and everyone is looking unsure and full of doubt, then Hobbs steps up with "I'll ride with you, Toretto."