Your Infiniti M37 delivers a refined balance of luxury and performance, but over time, suspension components wear out. Whether you're dealing with a bouncy ride, uneven tire wear, or clunking noises, choosing the right replacement parts is critical. This guide covers everything from struts and shocks to control arms and bushings, helping you navigate OEM vs. aftermarket options and make an informed decision.
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PM Auto Set of 4 Front-Rear Suspension Strut Assembly For 2011-2013 Infiniti M37 RWD
Understanding Your Infiniti M37 Suspension System
The M37 uses a sophisticated independent suspension setup: double-wishbone front and multilink rear. Key components include:
Struts and Shocks
Front struts (coilover units) and rear shocks control damping. The M37's sport-tuned suspension uses specific valving for its 330-hp V6. Worn struts cause excessive bounce and reduced steering response.
Springs and Sway Bars
Coil springs support the vehicle's weight, while sway bars (anti-roll bars) reduce body lean in corners. Over time, springs can sag, and sway bar bushings crack.
Control Arms and Ball Joints
Front upper and lower control arms with ball joints allow wheel movement. Bushings wear, leading to play and alignment issues. Rear control arms similarly degrade.
Stabilizer Links and Tie Rods
Stabilizer links connect sway bars to the suspension; worn links cause clunks. Tie rods connect the steering rack to the wheels; they affect steering precision and tire wear.
OEM vs. Aftermarket Suspension Parts for the M37
Choosing between genuine Infiniti parts and aftermarket alternatives depends on your priorities: longevity, cost, performance, or ride comfort.
OEM Infiniti Parts
OEM parts are exact matches for your M37, built to original specifications. They offer guaranteed fitment, durability (often 50,000–70,000 miles), and maintain the factory ride quality. The downside is higher cost, especially for assemblies like front struts that may include the spring.
Aftermarket Options
Reputable aftermarket brands like KYB, Monroe, Moog, and Bilstein offer direct replacements at a lower price. For example, KYB Excel-G struts are a popular OEM-quality alternative. However, verify compatibility with your M37's model year (2011–2013) and note that some aftermarket parts may be firmer or softer than stock.
Performance Upgrades
If you want sharper handling, consider:
- Coilovers: Adjustable ride height and damping (e.g., BC Racing, KW). Ideal for enthusiasts but can compromise ride comfort.
- Lowering Springs: Lower the center of gravity without replacing struts (like Eibach or H&R). Pair with high-performance shocks for best results.
- Sway Bars: Thicker bars from Stillen or Hotchkis reduce body roll. Install with polyurethane bushings for longevity.
Signs You Need New Suspension Parts
Watch for these symptoms:
- Excessive bounce: Push down on the hood; if it bounces more than twice after releasing, struts are likely weak.
- Clunking over bumps: Often indicates worn stabilizer links or control arm bushings.
- Uneven tire wear: Cupped or scalloped edges point to worn shocks or out-of-spec alignment.
- Vehicle sag: One corner sitting lower may mean a broken spring.
- Steering wandering: Worn tie rods or ball joints cause looseness.
If you notice any, inspect the system immediately to avoid secondary damage.
How to Choose the Right Suspension Parts for Your M37
Compatibility by Model Year
M37s from 2011 to 2013 share most suspension components, but verify part numbers. The M56 (with V8) uses heavier-duty springs and some different bushings. Cross-referencing with your VIN ensures correct fit.
Driving Style and Comfort vs. Performance
- Daily commuter: Stick with OEM or direct-replacement aftermarket (KYB, Monroe). Prioritize ride comfort and long life.
- Enthusiast/track: Upgrade to coilovers or sport springs. Expect a firmer ride but better cornering.
- Towing or heavy loads: Consider load-leveling shocks (like Monroe Load-Leveler) or air springs.
Budget Considerations
Full strut assemblies (pre-loaded with spring) save labor but cost more. Shop around for complete kits that include everything from struts to bushings.
Installation Considerations
DIY vs. Professional Installation
Replacing struts and control arms requires spring compressors, torque wrenches, and alignment tools. If you're experienced, you can save on labor (4–8 hours). However, a professional alignment after any suspension work is mandatory. Mistakes can compromise safety.
Expected Costs and Lifespan
- Struts/shocks: $150–$400 per corner (parts only).
- Control arms: $80–$200 each.
- Labor: $100–$200 per hour, total typically $500–$1,200.
- OEM parts last 60,000–80,000 miles; aftermarket may last 40,000–60,000 depending on quality.
Always replace in pairs (both front or both rear) to maintain balance.
Recommended Approach for Your Infiniti M37
For most M37 owners, a balanced approach works best: replace worn components with quality aftermarket parts that match OEM specs. For struts, KYB Excel-G or Bilstein B6 offer excellent durability at a fair price. Pair with Moog control arms and tie rods for robust steering. If you want a sportier feel without sacrificing daily comfort, consider Eibach Pro-Kit springs with Bilstein shocks. Whatever you choose, stick with reputable brands and always perform a professional alignment afterwards. Properly maintained suspension keeps your M37 riding smoothly and handling confidently for miles to come.