If you want a great driving experience every time you get behind the wheel, coilovers are a no-brainer. Adding coilovers does not void the Subaru warranty, but if something goes wrong with the suspension caused by the coilovers, Subaru could deny the warranty claim. That said, it likely won’t interfere with your powertrain warranty.
Unlike leaf springs, you install coilovers directly over the strut or shock, so they’re not separated. They’re easy to install since they come pre-assembled, but ensure they’re installed correctly to avoid issues with the suspension.
If you’re unsure whether adding coilovers to your Subaru will void the warranty, call your local Subaru dealer to confirm.