2006 Infiniti G35 4dr Performance Suspension Parts: Upgrade Guide

If you own a 2006 Infiniti G35 4dr (sedan), you already know it strikes a fine balance between luxury and sport. But after years on the road, the factory suspension can feel tired or too soft for aggressive driving. Upgrading to performance suspension parts sharpens handling, reduces body roll, and improves overall driving enjoyment. This guide covers the most effective suspension upgrades for the 2006 G35 sedan, focusing on realistic goals—everyday comfort with track-day capability, not pure race setup.

Why Upgrade the Suspension on a 2006 G35 4dr?

The stock G35 suspension was designed for a comfortable cruiser. It uses MacPherson struts up front and a multi-link rear, both tuned for ride quality. As mileage piles on, bushings wear, struts lose damping, and the car becomes floaty. Performance parts restore and improve control. Typical goals include:

• Lower ride height for a more aggressive stance and lower center of gravity.
• Reduced body roll in corners.
• Better steering response and feedback.
• Sharper turn-in and improved traction under acceleration.
• Ability to adjust ride height and dampening for street or track use.

Key Performance Suspension Parts for the 2006 G35 Sedan

Coilovers

Coilovers replace the entire strut/spring assembly with height-adjustable units. They are the most comprehensive upgrade for a G35 sedan.

• Adjustability: Most coilovers offer ride height adjustment, rebound/compression dampening, and sometimes camber plates. This allows you to dial in the perfect setup for daily driving or weekend autocross.
• Spring Rates: Aftermarket coilovers use stiffer springs than stock. Common rates for G35 sedans range from 8kg front / 6kg rear to 12kg front / 10kg rear. Rates around 10/8 kg are a good balance for street and occasional track use.
• Ride Quality: Quality coilovers (like Ohlins, KW, BC Racing, or Stance) can actually improve ride over bumps if properly adjusted. Cheap coilovers are harsh; it's worth spending $1,200+.
• Installation: Professional installation recommended. Expect 4–6 hours labor.

Recommendation: For a daily driver that sees autocross, choose coilovers with separate rebound and compression adjustment (e.g., Ohlins DFV or KW V3). For budget builds, BC Racing BR series offers reliability and adjustments.

Lowering Springs

If you want a lower stance without full coilover cost, lowering springs are a popular option. They replace the factory springs with shorter, stiffer ones, lowering the car 1–1.5 inches.

• Pros: Affordable ($150–$300), simple install, improves appearance and reduces body roll.
• Cons: You still use factory shocks, which may wear faster with stiffer springs. Ride can become bouncy if dampers aren't matched.
• Best Use: Cruising and mild performance; not ideal for track driving.
• Matching Shocks: Pair with Koni Yellow or KYB AGX adjustable shocks for best results.

Recommendation: Eibach Pro-Kit or H&R Sport springs are proven choices for the G35 sedan. They lower moderately and maintain reasonable ride quality.

Performance Shocks and Struts

If you want to improve damping without changing ride height, replace your worn struts with performance units. Adjustable shocks allow you to stiffen or soften damping as needed.

• Koni Yellow: Twin-tube design, externally adjustable rebound. Great for street and occasional track.
• Bilstein B6 or B8: Monotube, high-pressure gas; firmer than stock, not adjustable. B8 is for lowered cars.
• KYB AGX: Adjustable damping (4 settings). Cheaper but still effective.

Installation Tip: Always replace strut mounts and bump stops when changing shocks.

Sway Bars (Anti-Roll Bars)

Sway bars reduce body roll in corners. The G35 sedan benefits from a thicker rear bar to tame understeer.

• Stock: Front 25mm, rear 16mm.
• Aftermarket: Typical upgrades: front 27–30mm, rear 21–24mm, often adjustable.
• Effect: A larger rear bar (21–24mm) on soft setting reduces understeer without making the car too twitchy.
• Brands: Hotchkis, Eibach, Whiteline, Stillen. Hotchkis is popular for street-able handling.

Recommendation: Install a thicker rear sway bar first; you can always upgrade the front later. Adjustable bars allow fine-tuning.

Control Arms and Bushings

Old rubber bushings introduce slop. Replacing them with polyurethane or spherical bearings tightens the suspension.

• Front Lower Control Arm (LCA): Camber adjustment bolts can fix alignment after lowering. Fully adjustable LCAs (like SPL or GKTown) allow caster and camber tuning.
• Rear Toe and Camber Arms: The G35 sedan needs adjustable rear arms when lowered to correct alignment. Spherical-bearing arms (e.g., SPL, Megan Racing) provide precise geometry.
• Bushings: Polyurethane bushings for subframe, differential, and control arms reduce deflection. Full bushing upgrade is labor-intensive but transforms feel.

Installation Note: Alignments after any suspension work are mandatory. Budget $100–$150 for a proper alignment.

Strut Tower Braces

A strut tower brace ties the front shock towers together, reducing chassis flex during cornering. For the G35 sedan, a front brace (like from Cusco or Stillen) improves steering response. Rear braces are less noticeable but can help with sedan body flex.

Effect: Subtle but worth it as a finishing touch. Easy DIY install.

Putting It All Together: Practical Upgrade Paths

Budget Street Performance ($500–$1,000)

• Lowering springs (Eibach Pro-Kit) + Koni Yellow shocks
• Rear sway bar (Hotchkis or Whiteline 21mm)
• Camber bolts for front alignment

This setup lowers the car about 1.2 inches, tightens response, and reduces body roll. It retains decent ride comfort.

Sporty Daily Driver ($1,500–$2,500)

• Coilovers with adjustable dampening (BC Racing BR, Fortune Auto 500)
• Adjustable rear sway bar (Hotchkis set to middle)
• Adjustable rear toe and camber arms (SPL or Megan) for proper alignment
• Front strut tower brace (Stillen)

This combination gives you height adjustability, firm but controlled ride, and near-neutral handling. Great for spirited backroad driving.

Track-Ready Setup ($2,500–$4,000+)

• Premium coilovers (Ohlins DFV or KW V3)
• Full adjustable control arms front and rear (SPL Parts or GKTech)
• Both front and rear adjustable sway bars
• Polyurethane bushings throughout
• Reinforced subframe collars

This setup eliminates all play, maximizes tire contact, and allows aggressive alignment settings. Expect a stiff ride on rough roads; best for track days and serious enthusiasts.

Common Mistakes to Avoid

• Ignoring alignment: Lowering without adjustable arms leads to excessive camber, uneven tire wear, and poor handling. Always align after changes.
• Over-stiff springs: Extremely high spring rates (like 14k/12k) make the car unbearable on street bumps. Stick with rates that suit your roads.
• Front-only sway bar: Thicker front bar increases understeer, which the G35 already has. Always upgrade the rear first.
• Cheap coilovers: Sub-$800 coilovers often leak, ride harshly, and lack damping consistency. Invest in quality.
• Neglecting bushings: New dampers and springs won't feel crisp if control arm bushings are shot. Replace them if over 100k miles.

Final Recommendation

For most 2006 Infiniti G35 4dr owners seeking a balanced upgrade, start with a set of quality coilovers (like BC Racing BR series or Fortune Auto 500) and an adjustable rear sway bar. This transforms handling while maintaining daily usability. If your budget is tight, lowering springs paired with Koni Yellow shocks and a rear sway bar offer solid gains at half the cost. Whichever route you choose, invest in a professional alignment with proper camber and toe correction. The result is a G35 that corners flatter, responds faster, and feels more connected—without sacrificing the comfort that makes it a great grand tourer.