Disc.Turbo

In Mount Vernon, a mysterious clog backs up a downtown neighbourhood's sewer line. In Cleveland, the debris from a severe storm backs up a critical grit chamber.

In Mount Vernon, an abandoned sewer line is overwhelmed by stagnant human waste. And in New London, a large clog could take down a city building.

In Brooklyn, Dirty Water Don repairs outflow gates at a treatment plant. In Massachusetts, Rick tackles a grease trap at a meat cutting facility.

Winnebago Industries build a luxurious RV, and there's a look at historic NASA Astrovans. Music legend Willie Nelson shows off his tour bus.

A visit to an historic car auction in Paris has Rick's mind racing. The guys swing for the fences customizing a 1937 Zephyr for a demanding millionaire.

Pennsylvania locals go all-out for $5,000. Whoever goes all the way will be racing against Axman, who is known for never backing down.

Michigan. Michiganders compete for $5,000, and a racing wagon surprises everyone. Then, the last local standing goes up against Bobby Ducote for another $5,000.

Farmtruck and AZN gather another group of local racers in North Carolina. The last racer standing will get a chance to race against Justin Swanstrom.

Locals race in Alabama for $5,000, and the competition is feisty. The winner goes up against Scott Taylor, who has a surprise in store.

Locals from across America gather for the finale, where they'll face off for the win. Then, the final racer confronts small tire legend Boosted GT.

Henry and Fuzz find a rare custom IRIS Sporting Trials Car. It's irresistible for the boys who get to work returning it to its former glory.

The duo explore Shane's epic collection, where a stylish Lanchester LD10 catches their eye - a perfect fit for their love of post-war British cars.

Mike and Elvis take on a Porsche 911 in rough shape: it turns up in pieces on a trailer. If they can revive it, they'll take it on an epic drive through the Cairngorms.

Mike and Elvis have one of their toughest challenges yet: can they make an Audi RS6 estate car faster than a sportscar? Elvis has doubts after a hazardous test drive.

Mike and Elvis are determined to celebrate a dying breed, the iconic V8 engine. They've chosen a classic sports car to do it, the Mercedes SL55.

Mike brings back a modern classic, a rare 2001 Audi S4 Avant. Can Ant fix a mysterious engine leak, systemic problems in the cabin and an ugly dent in the rear.

Mike and Ant take a chance on a 2006 Porsche Cayenne Turbo S. This performance SUV has a lot of horsepower - but potentially daunting repair bills.