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3 Subaru Mods That Aren't Worth the Money (And What to Buy Instead) - Subimods.com
Subaru WRX exhaust system comparison

Cheap No-Name Exhaust Systems

Why They're a Waste

We get it — a full catback exhaust can be a significant investment, and that $200 eBay special looks tempting. But here's the reality: cheap, no-name exhaust systems are one of the most common regrets in the Subaru community. They cost you more in the long run than buying quality the first time.

Here's what typically goes wrong with bargain exhaust systems:

  • Thin-gauge steel that rusts and cracks — Many budget systems use low-grade mild steel that corrodes within months, especially in climates with road salt.
  • Poor fitment and alignment issues — Cheap hangers, misaligned flanges, and inconsistent pipe diameters lead to rattles, exhaust leaks, and frustrating install days.
  • Unbearable cabin drone — Without proper resonator engineering, budget exhausts produce a constant, fatiguing drone at highway RPMs that makes daily driving miserable.
  • Minimal performance gains — Slapping a cheap catback on your WRX or STI without proper mandrel bending and flow engineering yields little to no measurable horsepower.

Warning

Exhaust leaks from poorly welded budget systems can introduce unmetered air near your O2 sensors, triggering check-engine lights and potentially causing your ECU to adjust fueling incorrectly.

What to Buy Instead

Invest in a reputable, well-engineered exhaust system from a brand that understands Subaru platforms. Quality systems use 304 stainless steel, mandrel-bent piping, and properly tuned resonators to deliver real power gains with a sound profile you'll actually enjoy for years.

Brands like Remark, GReddy, Invidia, and AWE have spent years perfecting exhaust designs specifically for the WRX, STI, and BRZ. Their systems bolt up correctly, last the life of your car, and are engineered to complement your other modifications.

Browse our full selection of Subaru exhaust systems to find the right fit for your platform and build goals.

Pro Tip

If you're planning to go turbo-back, remember that any downpipe change on a boosted Subaru requires a retune. Pair your exhaust upgrade with a Cobb AccessPORT or a professional dyno tune to unlock the full potential safely.

Subaru WRX intake system and tuning

Intake Upgrades Without a Tune

Why It's a Waste

An aftermarket intake is one of the first mods every Subaru owner considers — and for good reason. A quality intake system can improve airflow, throttle response, and turbo spool. But here's where new enthusiasts throw money away: bolting on an intake without getting a retune.

On a naturally aspirated car, you might get away with it. On a turbocharged Subaru like the WRX or STI? You're playing with fire — sometimes literally. Here's why:

  • The factory ECU doesn't know what changed — Your stock tune is calibrated for the exact airflow characteristics of the OEM airbox. A new intake changes the volume, velocity, and temperature of incoming air, and the ECU's MAF sensor readings no longer match what the tune expects.
  • Lean conditions under boost — When the ECU misreads airflow, it can under-fuel the engine during heavy load. Lean conditions on a boosted EJ or FA engine are a fast track to knock, ringland failure, or worse.
  • Zero real gains without calibration — Without a tune to take advantage of the increased airflow, your engine is essentially compensating and pulling timing. You might actually lose power compared to stock.
  • Check-engine lights and erratic idle — Many owners report CELs and rough idle within days of installing an intake without recalibrating.

Warning

Running any bolt-on modification that changes airflow on a turbocharged Subaru without a proper tune is not just a waste of money — it's a reliability risk. The EJ257 in the STI and the FA20DIT in the WRX are both knock-sensitive engines that demand precise fueling.

What to Buy Instead

The mod itself isn't the problem — it's the approach. An intake paired with a proper tune is one of the best Stage 1 upgrades you can make. The key is doing both together, not one without the other.

Start with a quality intake system from trusted brands like COBB, GrimmSpeed, aFe Power, or AEM that are designed and tested specifically for your Subaru platform. These systems are engineered with proper MAF housing dimensions and heat shielding to deliver consistent, reliable airflow gains.

Then pair it with a tuning solution to unlock those gains safely:

  • Cobb AccessPORT — The gold standard for Subaru tuning. Flash off-the-shelf (OTS) maps that account for your intake, or use it as the foundation for a professional custom tune.
  • Professional dyno tune — For the best results, take your car to a reputable Subaru tuner who can dial in a custom map for your exact combination of parts, fuel quality, and altitude.

Pro Tip

Many Cobb OTS maps are specifically calibrated for popular intake systems from COBB and GrimmSpeed. Buying an intake that already has a matching OTS map available is the easiest, most cost-effective way to do your first power mod correctly.

Subaru coilover suspension comparison

Cheap Coilovers from Unknown Brands

Why They're a Waste

Lowering your Subaru and upgrading the suspension is one of the most transformative modifications you can make — when done right. Unfortunately, the market is flooded with $300-$500 coilover kits from unknown brands promising "32-way adjustable damping" and "track-ready performance." The reality is far less exciting.

Here's what actually happens when you go cheap on coilovers:

  • Terrible ride quality — Budget coilovers are typically under-damped or over-sprung, turning your comfortable daily driver into a bone-jarring mess that crashes over every imperfection in the road.
  • Leaking shocks within months — Poor seal quality and thin shock bodies lead to premature oil leaks. Once a damper leaks, it's essentially a pogo stick — dangerous and useless.
  • Corrosion and seized adjustment rings — Cheap coilovers use low-grade steel or aluminum that corrodes quickly. Within a season or two, your ride height adjustment rings seize completely, making future adjustments impossible without cutting them off.
  • Inconsistent damping between corners — Budget manufacturers have poor quality control. It's common to receive a set where each corner feels different, creating unpredictable handling that's actually worse than stock suspension.
  • No proper valving for your platform — Reputable suspension companies spend thousands of hours tuning damper valving for specific vehicles. Generic coilovers use one-size-fits-all internals that ignore your Subaru's unique weight distribution, geometry, and driving characteristics.

Warning

Your suspension is a safety-critical system. A blown damper or failed coilover spring at highway speed or mid-corner on a track day can have serious consequences. This is not the place to cut costs.

What to Buy Instead

Quality suspension is a buy-once, buy-right investment. Reputable manufacturers engineer their coilovers and suspension components with platform-specific valving, quality materials, and rigorous testing. The difference in ride quality, handling, and longevity is night and day.

Here are proven suspension brands we carry that deliver real results for Subaru platforms:

  • BC Racing — One of the most popular choices in the Subaru community, offering over 1,100 application-specific kits with excellent adjustability and proven reliability at a competitive price point.
  • HKS — A Japanese motorsports icon with over 50 years of engineering excellence. Their suspension systems are built for enthusiasts who demand precision and durability.
  • Bilstein — German-engineered mono-tube gas pressure dampers trusted by OEMs and racers alike. Their platform-specific Subaru applications deliver a perfect balance of comfort and performance.
  • Öhlins Racing — The gold standard in motorsports suspension. If you're serious about track performance or want the absolute best ride quality, Öhlins delivers unmatched damper technology.
  • Pedders — Australian suspension specialists with excellent Subaru-specific offerings that blend daily comfort with spirited driving capability.

Browse our full selection of Subaru coilovers and suspension to find the right setup for your driving style and budget.

Pro Tip

After installing any coilover or suspension upgrade, always get a professional alignment. Skipping this step leads to uneven tire wear, unpredictable handling, and negates the benefits of your new suspension. Budget an alignment into the cost of every suspension mod.

Well-built modified Subaru WRX

Spend Smart, Build Right

The Subaru enthusiast community is built on a foundation of passion, knowledge, and doing things the right way. Every dollar you invest in your build should move you closer to your goals — not set you back with failed parts, reliability headaches, or wasted weekends in the garage fixing problems that didn't need to exist.

Here's the takeaway from each mod we covered:

  1. Exhaust: Skip the bargain-bin systems. Invest in a quality stainless steel exhaust from a brand that engineers specifically for your Subaru platform. You'll get better sound, real gains, and a system that lasts.
  2. Intakes: The intake itself isn't the problem — installing one without a tune is. Always pair airflow modifications with proper ECU calibration through a Cobb AccessPORT or professional dyno tune.
  3. Coilovers: Your suspension is a safety-critical system and the foundation of how your car drives. Buy from a reputable manufacturer with platform-specific engineering and you'll feel the difference every single mile.

The common thread? Buy once, buy right. Cheap parts almost always cost more in the long run when you factor in replacements, repairs, and the frustration of living with something that doesn't work properly. Quality parts from proven brands pay for themselves in performance, reliability, and peace of mind.

Pro Tip

Not sure where to start or which parts are right for your specific Subaru? Reach out to our team — we talk to Subaru enthusiasts every day and we're happy to help you build a plan that matches your goals and budget.

Ready to invest in mods that are actually worth your money? Browse the full SubiMods catalog and build your Subaru the right way — the first time.

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