RacingJunk gets a chance to dive into the Kellymoss Porsche GT4R Clubsport concept at the Hoonigan pen at SEMA 2025.
Kellymoss, the winningest team in Porsche racing history, has once again raised the bar in motorsport innovation. At the 2025 SEMA Show, the Wisconsin-based powerhouse revealed the Kellymoss GT4R, a reimagined evolution of the Porsche GT4 RS Clubsport that blends precision engineering, lightweight construction, and decades of racing expertise.
Built upon Porsche’s acclaimed GT4 RS Clubsport platform, the GT4R represents Kellymoss’s “no compromises” approach to performance.
“When Porsche built the GT4 RS Clubsport, they created one of the most driver-friendly track cars ever made,” said Victoria Thomas, co-owner of Kellymoss. “But we asked ourselves, what if we could take it further? The GT4R is the answer—lighter, sharper, and more connected to the driver than ever before.”
Every detail of the GT4R was developed with one purpose: extracting every ounce of performance while preserving Porsche’s balance and feel. The titanium exhaust system sheds about 35 pounds while delivering a raw Cup-car tone. A complete aerodynamic redesign—including a new front splitter, rear diffuser, and massive rear wing—adds stability and grip at speed.
The GT4R also features a full carbon fiber body kit, a wider track with custom fenders for 12-inch front and 13-inch rear wheels, and an optional Kellymoss rear suspension kit that replaces the factory strut setup with upper and lower control arms for superior mechanical grip and precision.
This disciplined “less is more” approach—refining without overcomplicating—reflects Kellymoss’s decades of championship-winning experience in Porsche racing. The car, showcased in the Hoonigan exhibit at SEMA, rides on custom Rotiform wheels, representing a collaboration between two icons of performance culture.
“SEMA is the ultimate stage for innovation,” added Thomas. “It’s where the best builders in the world show what’s possible, and we’re proud to stand among them with a car that redefines what a Porsche track machine can be.”
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