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Take a look back at THE top fight on American Chopper.

Take a look back at one of the top fights on American Chopper.

Take a look back at one of the top fights of all time on American Chopper.

After Paul Jr. Designs is commissioned to build a custom chopper to commemorate the rebuilding of the World Trade Center site, the crew heads downtown for a tour.

How do you turn renderings of two world-trade-center towers and one transportation hub into one kick-ass -- and meaningful -- chopper design? Watch and learn.

Now that the engine and the chassis are together, it's time for some finishing touches before the crew takes the car on the road. This includes everything from fine detailing to a lavish interior, a customized sound system and top-notch wheels.

As the crew enters the final stages of the build, the engine has been completely restored and the car's body has been saved. Now it's time to paint. Watch as the crew consults NAPA's paint experts and brings the design from the page into reality.

After the parts have been coated with NAPA's signature colors, the crew gets together to reassemble the vehicle. It's in rough shape. Luckily, the crew has loads of new NAPA parts -- and the restored engine will be better than before.

Once the car has been broken down, shop manager Kenny explains how they're dividing up the parts of the vehicle to send them off to the paint shop. Daniel also explains how the shop will restore the engine using high-performance parts.

Hoping to clear the air, Paul Sr. sits down with Rick Petko to discuss the rumors he's heard about Rick leaving OCC for Paul Jr. Designs.

Deciding that yelling isn't good for his health, Senior adopts a new tactic to get things done around the shop. (And yes, he's KIDDING.)

With everyone at Paul Jr. Designs missing their former colleague Rick Petko, Mikey reveals his master plan to help liberate their old friend from OCC.

A slip of the mouse leads to an awkward social-media situation between Vinnie and Steve Moreau.

Jim Quinn and Mike Ammirati engineer a workaround so the Grainger Bike's exhaust isn't so close to the seat (which would make it HOT), while staying true to Jason's design.

Jesse James explains the three-way build-off between him, Paul Teutul Jr. and Paul Teutul Sr. ... as only Jesse James can.

Senior reveals what it's like to ride "uncomfortable as hell" rigids given his bad back, where he tends to test-ride bikes the most, and why he sometimes can't make an unveil.

In preparation for the WyoTech build, Paul Sr. and Christian -- a former student -- travel to Daytona to tour the tech-based trade school.

Days of hard work finally pay off when Justin Bieber gets his hot new wheels. Is the new Cadillac CTS-V all that the teen sensation wanted?

In order to make sure Justin Bieber's "Batmobile" is perfect inside AND out, West Coast Customs visits Asanti Wheels for the best money can buy.

It's not enough to have custom leather seats, Justin Bieber's "Batmobile" needs to have the bling to match.

Responsible for adding just enough power to support a studio grade sound system, this alternator is exactly what Justin Bieber needs.

Justin Bieber calls on Ryan Friedlinghaus of West Coast Customs to design his new Cadillac CTS-V - and, in typical Ryan fashion, he pulls out all the stops.

When Wayne is invited to attend the second annual Kuwait Concours d'Elegance, he speaks the universal language of cars using his 1931 Chrysler CG Imperial Lebaron Dual Cowl Phaeton.

A trip to the Kuwait - where American Muscle cars rule the scene - proves once and for all that cars speak a universal language, especially when you're speaking with the original designer of Lambourghini.

Wayne unveils his one of a kind, 1956 Karmann Ghia LowLight Judson Super Charged. This is one car that has been restored to perfection.