Can you mod a Subaru Forester?

Yes — you can modify a Subaru Forester in many ways, but the scope depends on model year, engine, and local rules. Mods can affect warranty, emissions compliance, and reliability, and some changes require professional installation.

What you can change in a Forester

Common modification categories and what they aim to achieve are listed below. These are the most accessible options for most owners, though availability varies by generation and market.

• Engine performance: ECU remaps, intake systems, exhaust upgrades, and fuel-system improvements designed to squeeze more power or improve throttle response.


• Forced induction and internal upgrades: custom turbo or supercharger kits exist for some older engines, but they require substantial tuning, cooling, fuel and engine-internal consideration; not all generations support reliable, safe boosts.


• Handling and braking: suspension upgrades, sway bars, springs or coilovers, upgraded dampers, and enhanced braking components for improved cornering and stopping power.


• Wheels and tires: lighter or wider wheels with performance tires; consider clearance, offset, and load rating.


• Exterior and interior personalization: cosmetic mods such as lighting, body kits, grills, upholstery, and infotainment upgrades.


• Electrical and software: upgraded head units, reverse cameras, dash cams, battery upgrades, and some power management mods; be mindful of electrical load and warranty.

Modding can be fun and can improve comfort, efficiency, or sportiness, but it's important to weigh benefits against costs and potential downsides.

Mod considerations by generation and market

Because Forester generations vary in engine design and drivetrain, some options are more feasible than others. In the United States, the latest generations primarily use a 2.5-liter naturally aspirated flat-four, with turbocharged variants appearing in earlier XT models or in other markets. In some markets, turbo or diesel variants exist. Before buying parts or hiring a shop, confirm compatibility with your exact model year, engine code, transmission type, and VIN.

Warranty, legality, and long-term costs

Modifications may void manufacturer warranties, complicate insurance, and affect resale value. Emissions-related mods can be illegal in some regions or fail during inspections. Always check local laws and your warranty terms before proceeding.

• Warranty implications: powertrain and bumper-to-bumper coverage may be voided by non-approved modifications.


• Insurance considerations: premiums may rise or coverage may change with significant mods.


• Long-term reliability: higher-power builds require robust cooling, fuel, and lubrication upgrades to stay reliable.

Proceed with a plan that includes a reputable installer, a clear budget, and a testing plan to monitor temperatures, fuel trims, and drivability after each change.

What to budget and expect

Costs vary widely depending on the extent of the mods, from simple bolt-ons to complete powertrain upgrades. The following list outlines common cost ranges and expectations for responsible modification projects:

• Simple bolt-ons (intake, exhaust, tune): generally a few hundred to a couple thousand dollars depending on parts and labor; gains are modest but noticeable.


• Suspension and wheels: upgrades can range from a few hundred to several thousand dollars, depending on goals and quality.


• Forced induction or major engine work: tens of thousands of dollars and significant tuning; requires robust supporting modifications.

Balancing cost with safety and reliability is key; many owners choose to phase upgrades so daily reliability remains intact.

Summary

Modifying a Subaru Forester is common and feasible, but it requires careful planning. Start with clearly defined goals, verify compatibility with your specific model year, and engage qualified technicians for any engine, transmission, or electrical work. Consider warranty, emissions, insurance, and long-term reliability in your decision. For many owners, a staged approach—comfort-focused upgrades, then handling or cosmetic tweaks—offers the best balance of usability and enjoyment.

Can you mod a forester?

Check these ADVANCED Subaru OFF ROAD MODS: If you want to go even more hardcore with your Subaru Forester Off Road Build, you can remove your sway bars or install a quick disconnect on your sway bar links. You are gonna have more body roll that's for sure but you will also get more articulation while off roading.

What year to stay away from a Subaru Forester?

You should generally stay away from Subaru Forester model years known for significant engine issues, such as the 1998–2001, 2003, 2006, 2009, and 2010 models due to head gasket failures and other problems. The 2011–2014 and 2014–2018 models are also problematic, particularly for excessive oil consumption, CVT transmission issues, and suspension problems, according to sources like Panda Hub, CoPilot for Car Shopping, CarBuzz, and MotorBiscuit. 
You can watch this video to learn more about the worst model years for the Subaru Forester: 44sCar ExpertlyYouTube · Apr 14, 2025
Specific model years to avoid

• 1998–2001: These early models are known for frequent head gasket failures, which can be costly to repair. 
• 2003 and 2006: These model years experienced recurring head gasket issues and other problems like electrical malfunctions and cooling system failures. 
• 2009–2010: These years saw engine stalling, head gasket problems, and engine oil pipe ruptures. The 2010 model received particularly low reliability ratings. 
• 2011–2014: The 2.5L engine (FB25) in these models is known for excessive oil consumption, which can lead to engine damage if not addressed. The 2011 model also had poor oil warning light design. 
• 2014: Often cited as one of the worst model years, this model is known for severe oil consumption, CVT transmission problems, and broken coil springs. 
• 2015: Continued issues with engine and transmission troubles were reported, along with airbag sensor malfunctions. 
• 2018: Recall issues related to faulty rear suspension springs and engine valves affected some models. 

Common issues across multiple years

• Head gasket failure: A common issue in many pre-2012 models, especially those with the 2.5L EJ series engine, typically occurring around 60,000 to 100,000 miles. 
• Excessive oil consumption: A major problem in models with the newer FB25 engine from 2011 to 2014, which can cause serious engine damage. 
• Transmission issues: The 2014 model's CVT transmission was prone to problems, and the 2015 model also had reports of transmission troubles. 
• Suspension and wheel bearings: Problems with rear suspension springs and premature wheel bearing wear were reported in some models, including the 2014. 
• Cracking windshields: A widespread issue across multiple model years, including the 2014 and 2017, which even led to a class-action lawsuit. 

What to look for when buying a used Forester

• If considering an older model (1998-2012), check for documented evidence of head gasket replacement, preferably with upgraded multi-layer steel gaskets. 
• For 2011-2014 models, be aware of excessive oil consumption and ensure the owner is diligent about checking oil levels. If possible, check the VIN for any service bulletins or extended warranty coverage related to oil consumption. 
• If looking at a 2014 or newer, get a pre-purchase inspection, with a specific focus on the transmission and suspension. 
• Look for rust, especially in areas with heavy road salt use. 

How can I make my Subaru Forester more powerful?

Outside of adding a turbo kit, you can get a modest bump in HP and torque by adding a low restriction cold air intake, and a performance exhaust system. Both are easy bolt-on mods. I've also found that using sport mode and manually shifting via shift paddles can be helpful like when entering or exiting a corner.

What's the fastest a Subaru Forester can go?

Subaru Forester Speed
The petrol version should be able to hit 200km/h, while the hybrid could be more limited.