Porsche 718 GT4 vs Cayman GTS — Which Is Worth Building?

The Porsche 718 Cayman GT4 and Cayman GTS represent the two most compelling variants in the 718 lineup for enthusiast owners — the GT4 as the most focused and uncompromising production Cayman ever built, and the GTS as the most complete balance of performance and everyday usability available in the 718 range. Both are outstanding cars. Both have strong aftermarket followings. And both make compelling cases as build platforms for different reasons.

The choice between them is one of the most nuanced in the current Porsche market — not a straightforward better or worse comparison but a genuine question of priorities and intended use that requires careful consideration before committing to either platform.

The Engines — Naturally Aspirated vs Turbocharged

The engine difference between the GT4 and GTS is the most fundamental distinction between the two cars and the one that defines their respective characters most completely.

The Porsche 718 Cayman GT4 uses a naturally aspirated 4.0 litre flat-six producing 414bhp at 7,600rpm — an engine derived directly from the 911 GT3's unit and one that represents the pinnacle of Porsche's naturally aspirated road car engine development in the current lineup. The GT4's flat-six revs freely and linearly to its 8,000rpm redline, building power in a way that demands and rewards driver commitment. Its acoustic character — the flat-six's distinctive mechanical note building through the rev range — is one of the most celebrated engine sounds in the contemporary performance car world.

The Porsche 718 Cayman GTS uses the turbocharged 2.5 litre flat-four producing 365bhp — the same engine fitted to the standard 718 S variants in a higher state of tune. The turbocharged flat-four delivers its power differently from the GT4's naturally aspirated six — stronger mid-range torque, a lower rev ceiling, and a power delivery character that is more accessible but less viscerally engaging than the naturally aspirated unit.

For owners who regard the naturally aspirated engine as a fundamental requirement — and the 718 GT4's flat-six is one of very few remaining naturally aspirated road car engines at this price point — the GT4 wins this comparison without qualification. For owners who prioritise everyday usability and accessible performance over the naturally aspirated experience, the GTS's turbocharged four-cylinder is more than adequate and in some everyday driving contexts more practical.

Performance — Closer Than the Engine Comparison Suggests

Despite the GT4's engine advantage in character terms, the performance difference between the GT4 and GTS in real-world driving conditions is less dramatic than the engine comparison suggests.

The Porsche 718 Cayman GT4 covers 0-62mph in 4.2 seconds and reaches a top speed of 188mph. The Porsche 718 Cayman GTS covers 0-62mph in 4.6 seconds and reaches a top speed of 180mph. The GT4 is faster — meaningfully so on a circuit where the naturally aspirated engine's ability to be worked hard repeatedly creates a performance advantage that the turbocharged GTS cannot match over a full session.

On the road the performance difference is less significant. The GTS's turbocharged mid-range torque creates impressive real-world pace in the speed ranges most frequently used on public roads — the 0-100mph sprint and overtaking performance that matters most for road driving are less dramatically different than the 0-62mph headline figures suggest. The GT4's advantage becomes most apparent at high revs on a circuit or an open road where the naturally aspirated engine's top-end power and the willingness to use its full rev range create an experience that the GTS cannot replicate.

Driving Character — The GT4's Defining Advantage

The driving experience comparison between the GT4 and GTS is where the choice is ultimately decided for most knowledgeable buyers — and where the GT4 makes its most compelling case.

The 718 Cayman GT4 is one of the most celebrated driver's cars of the modern era. Its naturally aspirated flat-six demands commitment — the power builds through the rev range and the most rewarding driving happens between 5,000rpm and the 8,000rpm redline where the engine delivers its best performance and its best sound. The GT4's suspension — stiffer, lower, and more focused than the GTS — creates a handling character that is immediate, communicative, and precise in a way that the softer GTS cannot fully match. The GT4's fixed rear wing, its wider tracks, and its motorsport-derived aerodynamic package create a car that is visibly and functionally more focused than any other production Cayman.

The GT4's RS variant — introduced alongside the current GT4 — takes this focus even further. A revised naturally aspirated flat-six producing 493bhp, a PDK gearbox, significant additional downforce from a new wing and diffuser arrangement, and a weight reduction program that strips the car aggressively for track use create a GT4 RS that is effectively a road-legal racing car. For owners building the most extreme possible track-focused 718, the GT4 RS is the starting point.

The 718 Cayman GTS is a more rounded and more everyday-usable car. Its turbocharged engine is more tractable at low speeds and in urban traffic. Its suspension — still sportier than the standard 718 but less extreme than the GT4 — provides a more comfortable ride on normal roads. And its standard equipment level — more comprehensive than the GT4's more spartan specification — makes it a more complete car for owners who use it regularly across a range of conditions.

The GTS is not a compromise car — it is genuinely excellent in its own right and significantly more driver-focused than the standard 718 S or 718 Cayman. But it is a different tool from the GT4, and owners who choose the GTS over the GT4 primarily for cost reasons rather than for its character should be honest with themselves about whether the naturally aspirated engine would be missed.

Visual Identity — Factory Aggression vs Subtle Presence

The GT4 and GTS have meaningfully different visual identities that inform the appropriate modification direction for each car.

The GT4 arrives with the most aggressive factory visual package available on a production Cayman — the fixed rear wing is the most prominent visual element and one that immediately distinguishes the GT4 from every other 718 variant. Combined with the wider tracks, the front splitter, and the side air intakes that feed the naturally aspirated engine's cooling requirements, the GT4 looks visibly focused and visibly purposeful in a way that the GTS does not attempt to match.

The GTS has a more subtle visual presence — sportier than the standard 718 S through its standard-fit sport exhaust outlets, its GTS-specific side intakes, and its lower suspension, but without the GT4's overt track-inspired elements. The GTS is a car that looks composed and purposeful rather than aggressive — a visual character that suits its more balanced everyday nature.

For aftermarket visual upgrades, the GT4's stronger factory aero foundation means additions need to complement rather than replicate what is already there. Carbon fiber splitter additions, carbon mirror caps, and carbon interior trim suit the GT4's existing track-inspired character naturally. The GTS's more restrained starting point accommodates a wider range of modification directions — from subtle carbon detailing that maintains the car's composed character to a more aggressive aero direction that moves it closer to the GT4's factory visual specification.

Aftermarket Support — Both Well Served

Both the GT4 and GTS benefit from the 718 platform's well-developed aftermarket ecosystem — and the distinction between what is appropriate for each model is more important than differences in parts availability.

For the GT4, exhaust upgrades that enhance the naturally aspirated flat-six's acoustic character are the most popular and most rewarding modification available. The GT4's engine deserves to be heard as clearly as possible — a quality high-flow sports cat and cat-back system reveals the flat-six's true acoustic potential in a way that the factory exhaust's noise regulation compromises prevent. Suspension upgrades that build on the GT4's already focused factory setup are appropriate for track-focused builds — coilover options with spring rates calibrated for the GT4's specific geometry and weight distribution are available from specialist manufacturers.

For the GTS, exhaust upgrades address the turbocharged flat-four's acoustic limitations directly — the factory exhaust's restriction and the PDK gearbox's refinement combine to create a car that sounds significantly less dramatic than its performance credentials suggest. A quality valved cat-back system transforms the GTS's exhaust character and is the most impactful single modification available for this variant. ECU remapping on the GTS's turbocharged flat-four delivers meaningful power gains that bring its performance closer to the GT4's naturally aspirated benchmark — a stage two tune with downpipes on the GTS delivers power outputs that approach or match the GT4's standard specification while retaining the turbocharged engine's mid-range accessibility.

Carbon fiber aero additions work well on both variants — front splitters, rear diffusers, and carbon mirror caps are available for the 718 platform and suit both the GT4 and GTS's visual characters when chosen appropriately for each model's factory aero level.

The Build Decision — Which Is the Better Platform?

The honest answer depends entirely on what the build is intended to achieve and how the car will be used.

Build the GT4 if the naturally aspirated flat-six engine is non-negotiable — if the sound, the character, and the emotional involvement of a high-revving naturally aspirated engine are what you want from the car above everything else. Build the GT4 if track use is a significant priority — the factory suspension, aerodynamics, and brake specification create a car that arrives closer to a serious track tool than any other 718 variant. And build the GT4 if the most focused, most demanding, and most rewarding driving experience available in the 718 range is what you are seeking.

Build the GTS if everyday usability alongside strong performance is the priority — if the more tractable turbocharged engine suits your regular driving conditions better than the naturally aspirated GT4. Build the GTS if the tuning potential of the turbocharged flat-four interests you — a well-tuned GTS approaches GT4 performance levels while retaining the everyday flexibility of the turbocharged engine. And build the GTS if a more balanced, more versatile car that does everything well across a wider range of conditions suits your ownership lifestyle.

Both are outstanding 718 variants. Both deserve to be built with care and the right parts. At Velocity Exhausts we stock parts for the complete 718 range — browse our full Porsche 718 collection and build your 718 the right way.