If you own a Porsche 986 Boxster (1997–2004) and are looking to upgrade or replace suspension components, you may have wondered whether parts from the later 987 generation (2005–2012) can be swapped over. The two generations share the same basic architecture, and many suspension components are direct bolt-ons. However, not everything is interchangeable, and some require modifications. This guide covers which 987 suspension parts work with the 986, what to watch out for, and how to make informed decisions for your car.
Overview of 986 vs 987 Suspension Differences
The 986 and 987 Boxsters use similar front and rear suspension designs: MacPherson struts up front and a multi-link rear. The mounting points and geometry are largely the same, but the 987 benefited from refinements. The 987.1 (2005–2008) and 987.2 (2009–2012) have differences in damper valving, spring rates, and some bushing designs. The 987.2 introduced a different front strut design with an updated top mount. Understanding these nuances helps avoid buying parts that won't fit or require extra work.
Compatible Parts from 987 That Fit 986
Front Struts and Shocks
The front strut assemblies from any 987.1 (non-S, S, and even the Cayman) are a direct bolt-on to the 986. The mounting points, spring perches, and lower control arm attachment are identical. The 987.2 front struts have a different top mount design (three-bolt vs two-bolt) and require a modified top mount or conversion. If you have a 986, stick to 987.1 front struts for a hassle-free swap. The 987.1 front dampers are generally stiffer and more responsive than the 986 units, offering improved handling without changing spring rates.
Rear Shocks
Rear shocks from the 987.1 also fit the 986 directly. The lower eyelet and top mounting points are the same. The 987.2 rear shocks have a different lower mounting eyelet size (12mm vs 10mm) and likely won't fit without modification. Therefore, for a direct fit, use 987.1 rear shocks. Many owners report that 987.1 shocks paired with 986 springs provide a noticeable improvement in damping control.
Springs
Coil springs from the 987 are physically interchangeable with the 986. The front and rear springs have similar dimensions and rates, but the 987 springs are typically stiffer. 987.1 S and non-S springs can be used on the 986, but be aware that the 987 S springs are significantly stiffer and may raise the ride height slightly if the 986's strut mounts are different. Lowering springs designed for the 987 (like H&R or Eibach) also fit the 986, but ensure they are for the 987.1, as 987.2 springs have a different free length. A common upgrade is to fit 987.1 sport springs (from the Boxster S or Cayman S) onto a 986, which drops the ride height about 10mm and improves turn-in.
Sway Bars
Front and rear sway bars (anti-roll bars) from the 987 are a direct swap onto the 986. The mounting points and diameter are almost identical. The 987.1 Boxster S front sway bar is 21mm, compared to the 986's 18mm, offering less roll. The Cayman front sway bar (22mm) is also a popular upgrade. Rear sway bars from the 987 (18mm or 19mm) fit without issues. Replacing only the sway bars is one of the most cost-effective suspension upgrades for a 986.
Control Arms and Links
Front control arms (lower wishbones) from the 987.1 are interchangeable with the 986. The ball joint and bushing sizes are the same. However, the 987.2 uses a different control arm design with an integrated ball joint that may not align properly. Rear control arms (toe links, trailing arms) are generally not compatible between generations due to changes in mounting geometry. Stick to 986-specific parts for the rear unless you are doing a full subframe swap. Drop links (end links) from the 987.1 front and rear fit the 986 sway bars perfectly.
Other Components
- Coilovers: Many coilover kits for the 986 also fit the 987.1, and vice versa. For example, KW V1/V2/V3 and Bilstein PSS10 are designed for both chassis. Check the manufacturer's fitment chart.
- Top Mounts: 987.1 front top mounts are identical to 986. 987.2 front mounts require a different bolt pattern. Rear top mounts are the same across 986 and 987.1.
- Strut Tower Brace: A 987 strut tower brace will fit the 986 front, but the rear cross-tower bar might need slight modifications.
- Subframes: Not interchangeable without major fabrication.
Important Considerations and Modifications Needed
While many parts bolt on, mixing components from different generations can alter geometry and ride quality. Here are key points:
- Spring/Shock Pairing: If you swap 987 shocks with 986 springs, the damping might not be ideal. It's best to use matched sets (shocks and springs designed for the same car).
- Ride Height: 987 springs are slightly different in free length; using 987 springs on 986 struts can raise or lower the car by a few millimeters. Expect minimal changes.
- Bushings: 987 bushings are stiffer and may transmit more road noise. Polyurethane bushings are aftermarket alternatives.
- ABS and Sensors: No issues; suspension parts don't affect electronics.
- Wheel Alignment: After any suspension swap, get a four-wheel alignment. The 986 and 987 have similar alignment specs, but finalize with a competent shop.
Performance Differences
Swapping 987 suspension parts onto a 986 typically improves handling without sacrificing daily comfort. The 987 shocks provide better high-speed stability and less body roll. Stiffer springs from the 987 S or Cayman S reduce weight transfer during cornering. Sway bars are the easiest upgrade: a 987 front bar significantly flattens cornering. Overall, the combination of 987 struts, shocks, and sway bars transforms the 986 into a more composed, confident car.
Final Recommendation
For a straightforward upgrade, replace your worn 986 front struts and rear shocks with 987.1 units (Boxster S or Cayman versions). Add a set of 987.1 sport springs from an S model or aftermarket lowering springs, and swap the front sway bar to a 987 S or Cayman bar. This combination delivers noticeable handling gains with minimal cost and no fabrication. Avoid 987.2 parts unless you are prepared to modify top mounts and lower mounts. Always consult a Porsche specialist or a trusted mechanic before proceeding.
Upgrading your 986 with 987 suspension parts is a smart way to modernize the car's behavior without breaking the bank. Focus on compatible dampers, springs, and sway bars, and you'll enjoy a significantly improved driving experience.