The Infiniti G37 has enough factory performance to be enjoyable without modification, but its strong VQ37 engine, rear-wheel-drive-based chassis and large aftermarket make it a popular project car. The easiest mistake is buying visible parts before confirming that the car is mechanically healthy. A G37 with fresh fluids, quality tires, good brakes and proper alignment will usually drive better than a neglected car with an intake, loud exhaust and oversized wheels.
This beginner build guide organizes modifications in a sensible order. It focuses on improvements that can make the car safer, more responsive and more enjoyable without turning it into an unreliable or uncomfortable daily driver.
Stage Zero: Maintenance Before Modification
Begin with a complete inspection. Check engine oil, coolant, brake fluid, transmission fluid, differential fluid and power-steering fluid where applicable. Inspect belts, hoses, the heater-hose connection, battery condition, tires, brake pads, suspension bushings and engine mounts. Scan all control modules for stored codes before clearing anything.
A modification cannot compensate for low oil pressure, a coolant leak, worn wheel bearings or failing suspension components. If the car has unknown history, establish a maintenance baseline and keep receipts. This also makes later troubleshooting easier because you will know which problems existed before the upgrades.
Tires Are the Best First Performance Upgrade
Quality tires improve acceleration, braking, steering response and wet-weather safety at the same time. Choose a tire category that matches the climate and how the car is driven. A daily driver may benefit from an ultra-high-performance all-season tire, while a warm-climate weekend car may use a summer tire. Drivers in true winter conditions should consider dedicated winter tires.
Use the correct load rating and confirm fitment before ordering. On AWD models, all four tires should remain closely matched in size and tread depth. A fresh alignment should follow tire or suspension changes, especially if the previous tires show uneven inner-edge wear.
Brake Improvements for Street Use
Most street-driven G37s do not need an expensive big-brake kit. High-quality pads, fresh brake fluid and correctly serviced rotors can provide a noticeable improvement. Select pads according to use: a quiet daily-driver pad, a more aggressive street pad or a track-oriented compound. Track pads may squeal, create dust and perform poorly when cold.
Inspect calipers, slide pins, hoses and wheel bearings during brake service. Stainless braided hoses can improve pedal feel, but installation must be careful and the system must be bled correctly. Brake modifications should prioritize consistent performance and safety rather than appearance.
Suspension and Handling Upgrades
A rear sway bar is a common handling upgrade because it can reduce body roll without the ride-quality penalty of very stiff springs. Worn factory dampers should be replaced before adding aggressive components. For a daily driver, quality replacement dampers and moderate lowering springs may offer a better balance than inexpensive coilovers.
Coilovers provide height and damping adjustment, but low-cost kits can ride harshly and may not control the car well. Excessive lowering changes suspension geometry, reduces travel and increases the likelihood of tire rubbing. After installation, obtain a professional alignment and verify that the tires clear throughout steering and suspension movement.
Exhaust Modifications and Sound
An axle-back or cat-back exhaust can change the character of the G37 without opening the engine. The VQ engine can become raspy or produce heavy cabin drone when multiple loud components are combined, so listen to real examples recorded under acceleration and steady highway speed before purchasing.
A resonated system is usually easier to live with than the loudest available option. Check local noise and emissions rules before modifying catalytic converters or other emissions equipment. Removing required emissions components can make the vehicle illegal for street use and may create warning lights or inspection problems.
Intakes, Tuning and Realistic Power Expectations
Short-ram intakes often add sound more than meaningful power. A properly designed cold-air system may support a tuned combination, but heat shielding, sensor placement and filter quality matter. Poorly designed intakes can create inconsistent airflow readings or draw hot engine-bay air.
An engine tune should come from a reputable calibrator who can explain fuel requirements, logging and safety limits. Do not rely on a generic file with unknown settings. Naturally aspirated gains are usually incremental, so the best build combines several compatible parts rather than expecting one product to transform the car.
Wheels, Fitment and Appearance
Wheels can dramatically change the look of the G37, but width, offset, center bore, brake clearance and tire size all matter. A wheel that bolts on can still rub, contact a brake caliper or place the tire outside the body. Use physically verified fitment examples for the exact sedan, coupe or convertible.
Avoid choosing the heaviest or largest wheel simply for appearance. Additional unsprung weight can reduce acceleration, ride quality and steering response. Properly fitted wheels with quality tires will make a better modification than stretched tires or extreme spacers.
Interior and Technology Upgrades
A modern head unit, CarPlay interface, backup camera or improved speakers can make an older G37 easier to use every day. Factory navigation and climate controls can complicate replacement, so confirm whether an interface retains steering-wheel controls, factory audio, cameras and vehicle settings.
Use vehicle-specific wiring harnesses and avoid cutting the factory loom. Poor electrical work is a common source of battery drains and intermittent faults. A clean installation with proper grounding and protected connections is worth more than a cheaper product installed quickly.
Sample Beginner Build Order
A practical build order is maintenance, tires, alignment, brake service, a moderate sway-bar or suspension upgrade, then sound and appearance. Power modifications should come later, after the engine and drivetrain have proven healthy. This sequence produces a car that feels better at every stage rather than one that looks modified but drives poorly.
Set a complete budget that includes labor, alignment, replacement hardware and unexpected repairs. It is better to install fewer high-quality parts than to replace a collection of inexpensive components twice.
Final Thoughts
The best first G37 modifications improve the complete car. Tires, brakes, maintenance and alignment provide benefits on every drive. Suspension and exhaust changes should match how the vehicle is actually used, not just how it appears in photos.
Build gradually, document each change and evaluate the car before moving to the next step. A well-planned G37 can remain comfortable and dependable while becoming more responsive, personal and enjoyable.