Melbourne workshop wows Porsche world with hand-built uber-911

The Porsche restomod game is formulaic. Take a classic 911, strip it back, throw some carbon fibre at it, upgrade the suspension, charge a small fortune, done. Singer in California has turned this into a multi-million dollar art form – and a multi-year waiting list.
But a Melbourne outfit called Zeigler/Bailey has decided that approach isn’t nearly complicated enough. It’s added an extra level of difficulty and differentiation – no hotrodded Porsche engine here… Instead, it’s designed and built its own. From scratch. In Australia.
The Z/B 4.4 starts life as a 1975-89 Porsche 911 G-series – the galvanised-body cars that exist in decent numbers globally. From there, things get properly ambitious. The entire floor is cut out and replaced with a new, symmetrical steel platform, which Z/B says means the car can be converted from right- to left-hand drive in about a day!!!
The suspension geometry is binned in favour of a setup derived from Le Mans prototype racing.
The Engine Nobody Thought Possible
And that engine bay? It gets something that didn’t exist until Zeigler/Bailey made it – a 4.4-litre air-cooled flat-six machined from solid aluminium billet.
Not cast – machined. Indeed, the engine block, cylinders, and cylinder heads are all carved from solid metal because the displacement Zeigler/Bailey wanted (4387.86cc, to be precise) simply wouldn’t fit within any existing Porsche engine architecture.
Claimed outputs are 300kW and 500Nm – which, for context, slightly exceeds the current 992-generation Porsche 911 Carrera. From an air-cooled engine. With two valves per cylinder.
The crankshaft and camshafts are billet steel. The exhaust valves are made from Nimonic alloy – the stuff they use in jet turbines.
Each cylinder head port is individually vacuum tested. It’s the kind of obsessive detail that would make even a Singer customer nod approvingly.
3D-Printed Exhaust? Sure, Why Not
And there’s genuinely unique and world-first tech. The exhaust system is 3D-printed in stainless steel – something Zeigler/Bailey claims is a world first for a production vehicle.
In fact, there are only three major weld assemblies in the entire system; the rest is printed as single pieces with all mounting hardware and bolt threads integrated.
The benefit isn’t just bragging rights. 3D printing allows exhaust tuning that’s impossible with traditional fabrication. And because there are no tacked-on brackets or welded joins, there’s nothing to crack or fatigue over time.
The system also features a vacuum-operated valve that switches between Quiet and Track modes via the triple tailpipes.
Who’s Behind This?
The partnership is an odd one. John Zeigler Jr spent three decades in advertising, culminating as Chairman and CEO of DDB Group Asia Pacific – 33 agencies, 14 countries, 3200 employees. He was named Global Marketer of the Year in 2013. His father was a legendary Australian hot rodder in the 1970s.
Greg Bailey is a South African engineer who emigrated to Australia in 2017 after stints at Ford and Toyota. His previous work includes designing an LMP2 Le Mans prototype from the ground up – a car that was displayed at Le Mans in 2012. He holds a Diploma in Mechatronics and designed the Z/B 4.4’s CAN bus electronics system because, apparently, building a new engine wasn’t enough of a challenge.
The Catch
The entry price for the Z/B 4.4 is $1.6 million, and that doesn’t include the donor car. Build time is approximately 12 months. Zeigler/Bailey plans to produce just 10 vehicles per year for the Australian market.
For that money, you get a vehicle that’s been engineered to meet applicable Australian Design Rules – something many restomods don’t bother with. The steel doors and front trunk lid are retained for side-impact compliance.
There’s also a telemetry system, GPS tracking via a dedicated app, remote diagnostics, and owner-customisable digital instrumentation that looks analogue but isn’t.
What It Actually Means
Zeigler/Bailey isn’t trying to compete with restomod royalty, Singer on volume. Singer employs 600 people and has completed more than 450 restorations. But Singer doesn’t build its own engines – those come from Cosworth and Williams.
The Melbourne company is positioning the 4.4-litre engine as a standalone product, targeting up to 1000 units annually for the global air-cooled Porsche restoration market.
The car exists to prove the engine works.
Whether that’s commercially viable remains to be seen. But for now, Australia has a genuinely unique performance car project to be proud of… Designed from first principles in an inner-Melbourne workshop.
That’s worth paying attention to, even if you’ll never get close to affording one.






