Best Upgrades for the Porsche 718 Cayman and Boxster

The Porsche 718 is one of the most dynamically gifted cars available at any price point. Its mid-engine layout gives it a handling balance that front and rear-engine cars simply cannot replicate — neutral, communicative, and exploitable in a way that makes every road feel like it was designed specifically for the car. The Cayman in particular has long been regarded by driving purists as the finest handling car Porsche makes, full stop.

But as with any performance car, there's a gap between what the factory delivers and what the car is truly capable of. The 718's turbocharged flat-four engine divides opinion on sound, the suspension is calibrated for comfort as much as performance, and the factory visual package — while clean and purposeful — leaves room for owners who want their car to look as focused as it drives.

This guide covers the best upgrades available for the Porsche 718 Cayman and Boxster, across aero, exhaust, suspension, and carbon fiber.

1. Carbon Fiber Front Splitter

The 718's front end is one of its cleanest angles — wide, low, and purposeful. A carbon fiber front splitter extends the lower bumper line and adds genuine front downforce, transforming the car's visual presence from composed to aggressive without compromising the design language Porsche built into it.

The 718 Cayman and Boxster share the same front bumper structure, meaning front splitter options developed for one body style will fit the other. This is useful to know when shopping — it effectively doubles the range of verified fitment options available compared to a model with a unique front end.

For GTS and GT4 variants with more aggressive factory front ends, a splitter addition sits naturally within the existing aero philosophy. For standard Cayman and Boxster models, a front splitter is the single most impactful visual upgrade available and the natural starting point for any build.

2. Exhaust Upgrades

The 718's turbocharged 2.0 and 2.5-litre flat-four engines are technically impressive but acoustically controversial. The flat-four's exhaust note is noticeably different from the naturally aspirated flat-six that powered previous Boxster and Cayman generations — a fact that Porsche has acknowledged by introducing the naturally aspirated flat-six GT4 and Spyder variants at the top of the range.

For turbocharged 718 owners, an exhaust upgrade is the most effective way to address the car's acoustic character. A valved cat-back system transforms the flat-four's sound significantly — adding volume, improving the exhaust note's character under load, and introducing the kind of overrun behaviour that makes every gear change more involving.

Sport cat or decat downpipe upgrades combined with an ECU remap push the 718 further still — improving turbo response, increasing torque in the mid-range, and giving the engine a more urgent, responsive character that suits the car's chassis capability. On the 2.5-litre turbocharged unit in the S variants, the gains from a supporting tune alongside exhaust upgrades are particularly noticeable.

3. Coilover Suspension

The 718's factory suspension is well-sorted but, like all Porsche road cars, calibrated to serve a wide range of customers across a wide range of road conditions. A quality coilover kit unlocks the car's chassis potential properly — allowing you to set ride height, spring rate, and damper tuning specifically for how you use the car.

The mid-engine layout of the 718 means suspension tuning has a more direct effect on handling balance than on most cars. Small changes to front and rear ride height affect weight distribution measurably, which affects turn-in, mid-corner balance, and on-limit behaviour in ways that are immediately felt from the driver's seat. A correctly set up 718 on a quality coilover kit is a genuinely transformative experience.

For road use, a modest drop of 15–20mm with dampers in a comfortable setting gives the car a dramatically improved stance and sharper responses without sacrificing everyday usability. For track use, a more aggressive setup extracts the full potential of the 718's exceptional chassis balance.

4. Carbon Fiber Rear Spoiler

The 718 Cayman's roofline flows into a short tail that is one of the car's most elegant angles. A carbon fiber rear spoiler addition builds on this, adding visual punctuation to the car's rear profile and generating meaningful downforce on a car that, given its mid-engine balance, responds particularly well to rear aerodynamic enhancement.

Two styles work well on the 718 Cayman — a subtle ducktail spoiler that follows the roofline's natural angle and extends it rearward, and a more pronounced blade spoiler on carbon uprights for a GT-inspired aesthetic. The ducktail is the more restrained and widely regarded as the more harmonious choice for the Cayman's body shape. The blade suits more aggressive builds and track-focused cars.

For the 718 Boxster, soft-top and PDK spoiler options differ in mounting configuration — verify your specific variant before ordering.

5. Carbon Fiber Side Skirts and Diffuser

Side skirt extensions and a carbon fiber rear diffuser complete the lower body package on the 718 and are the natural companions to a front splitter upgrade. Together these three elements — splitter, skirts, diffuser — create a visually coherent aero package that transforms the 718's stance from composed road car to something that looks genuinely track-bred.

The 718's rear diffuser sits below the engine lid and between the exhaust outlets. A carbon replacement adds visual depth and a race-derived aesthetic that contrasts beautifully with the body colour. As with the 992, exhaust configuration affects diffuser fitment — verify outlet position compatibility alongside chassis code when ordering.

6. Wheel and Brake Upgrades

The 718 sits on relatively conservative wheel sizes in standard form on base models. Stepping up to a wider, larger diameter wheel and tyre combination fills the arches properly and transforms the car's stance. The 718's 5x130 bolt pattern is shared with other Porsche models, giving a wide range of verified wheel options to choose from.

Brake upgrades — larger discs, uprated pads, braided lines — are particularly worthwhile on the 718 if you track the car. The standard brakes are adequate for road use but fade relatively quickly under sustained track use. An uprated pad compound alone makes a noticeable difference for occasional track days without requiring a full caliper conversion.

Building the Perfect 718

The 718 Cayman and Boxster reward a thoughtful, progressive approach to upgrading. The car's mid-engine balance means changes in one area have a more pronounced effect on overall character than they would on a front or rear-engine car. Start with the upgrades that make the biggest difference to how the car looks and sounds — splitter, exhaust, coilovers — then build from there as you develop a clear picture of what you want from the finished car.

All Porsche 718 parts at Velocity Car Parts are verified for Cayman and Boxster fitment. Browse our full Porsche collection at velocitycarparts.shop and build your 718 the right way.