Today, Kellymoss, the winningest team in Porsche racing history, revealed the Kellymoss GT4R at the SEMA Show 2025, setting a new benchmark for race car innovation and craftsmanship, officials stated in a press release. Built upon the acclaimed Porsche GT4 RS Clubsport platform, the GT4R embodies Kellymoss’s relentless pursuit of performance and precision, engineered by racers, for the driven or uncompromising, the team said.
“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.”
Porsche’s Engineering Excellence & Kellymoss’s Ingenuity
The Kellymoss GT4R merges Porsche engineering excellence with the ingenuity that has defined Kellymoss’s racing dominance for more than three decades, noted the release. From the titanium exhaust that delivers a raw Cup car soundtrack to the multilink rear suspension that transforms handling, the team said that every component and modification was considered to achieve more grip, more feedback and more connection between driver and machine.
Key modifications include:
- Titanium exhaust system with high-flow catalytic converters and muffler delete, reducing weight by approximately 35 pounds and enhancing throttle response.
- Full aerodynamic redesign, including a new front splitter, rear diffuser and a massive rear wing for significant downforce and stability at high speeds.
- Carbon fiber body kit encompassing hood, bumpers, fenders, rockers and diffuser to reduce mass, increase rigidity and offer customizable finish options.
- Wider track with custom fenders and quarter panels, allowing for 12-inch front and 13-inch rear wheels for increased cornering grip.
- Optional Kellymoss rear suspension kit, an in-house installation that elevates handling precision beyond Cup-car levels, replacing factory strut design with upper and lower control arms, correcting bump steer and camber curves for massive improvement in mechanical grip.
Kellymoss says the GT4R is both a showcase of the team’s engineering philosophy and a tribute to Porsche’s motorsport legacy, balancing innovation with restraint. Each enhancement was measured for maximum value and harmony with the original chassis, a disciplined “less is more” approach honed through years of championship-winning experience.
The GT4R Is on Display at the Hoonigan Exhibit
Displayed within the Hoonigan exhibit at SEMA, the GT4R represents a collaboration between two icons of performance culture. The build rides on custom Rotiform wheels, part of Hoonigan’s premium aftermarket lineup.
“SEMA is the ultimate stage for innovation,” said 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.”