The iconic four-mile long Road America racetrack in Elkhart Lake, Wisc., holds a special place in the hearts of American road racing enthusiasts, so it is only fitting that Wisconsin is also home to the largest road racing shop – Kelly-Moss Motorsports – in North America.

Kelly-Moss Motorsports’ owners are brothers David and Jeff Stone, who began building race cars and managing racing programs in 1988. Over the past 24 years, the duo has developed a full-service facility that prepares race cars without outsourcing one bit of work.

“We determined the only way to truly guarantee quality is to do it all in-house,” Jeff Stone said. “We have the ability to work whatever hours needed to meet quality control because everything is right here in our shop. No one else in the business can do that.”

The 60,000-square-foot facility has a road car department that services everyday vehicles, a wheel drive chassis dynamometer (dyno), a full engine development and build department, a fabrication shop, a machine shop and a parts department. And after the vehicle is built, it can receive the finishing exterior touches in the Kelly-Moss Motorsports paint and vinyl graphics departments.

Kelly-Moss will field five cars in the IMSA GT3 Cup Challenge by Yokohama Series at the Road Race Showcase this weekend at Road America.

Driver Tim McKenzie earned Kelly-Moss a victory at the season opening Mobil 1 12 Hours of Sebring, but has been forced to sit out for the rest of the season after being diagnosed with pancreatic cancer.

“Tim has gone through chemotherapy and surgery, and he’s recovering now,” Jeff Stone said. “We hope everyone keeps him in their thoughts and can’t wait to have him back with us at the track because we miss his camaraderie.”

The other Kelly-Moss Motorsports Drivers competing in the IMSA GT3 Cup Challenge by Yokohama Series are relatively new to racing Porsche 911’s.

“Aside from Tim, many of our drivers in 2012 are new to the series and to Porsches,” Stone said. “They’re finding their way through the season and all the new tracks to learn.”

Stone sees the GT3 Cup Challenge Series as a great place to get your feet wet in racing.

“I don’t think there’s a better value in racing anywhere,” he said. “You’re in a big paddock with the American Le Mans Series presented by Tequila Patron, and we’re able to do a season of GT3 Cup for a client for about one-tenth of a very low GT program in the ALMS.”

Unlike most other race cars, the Porsche 911 does not significantly de-value over time.

“The cars have such a high residual value that the car itself is an asset,” Stone said. “Most other cars you buy for $200,000 and they’re only worth $75,000 at the end of season. You find great competition with this car too. It’s the greatest race car ever developed in my opinion.”

Road America fans can catch Kelly-Moss Motorsports cars on-track this weekend with drivers David Ducote, Paul Barnhart, Jr., Wayne Ducote, Seth Davidow and William Peluchiwski. Practice at Road America for the IMSA GT3 Cup Challenge by Yokohama cars begins Thursday, August 16.