The Infiniti G35 is a popular platform for modification, and the 2003 sedan is no exception. Guys, if you're looking to personalize your ride and enhance its performance and aesthetics, the G35 offers a ton of possibilities. This article dives deep into the world of modifying a 2003 Infiniti G35 sedan, covering everything from performance upgrades to visual enhancements. We'll explore some of the most popular modifications, discuss the benefits and drawbacks of each, and provide valuable insights to help you make informed decisions for your own build. Whether you're a seasoned gearhead or just starting your modification journey, this guide will equip you with the knowledge you need to create a truly unique and head-turning G35.

Performance Upgrades

When it comes to performance upgrades for the 2003 Infiniti G35 sedan, the sky's the limit. The VQ35DE engine that powers this car is known for its reliability and responsiveness, but it can also be easily modified to produce significantly more power. Let's take a look at some of the most common and effective performance modifications.

Intake and Exhaust Systems

Upgrading the intake and exhaust systems is often the first step for G35 enthusiasts looking to boost performance. A cold air intake (CAI) replaces the factory airbox with a less restrictive design, allowing the engine to breathe more freely. This results in improved throttle response and a slight increase in horsepower and torque. Popular CAI brands for the G35 include Injen, K&N, and Stillen. On the exhaust side, a cat-back exhaust system replaces the factory exhaust from the catalytic converters back to the mufflers. This reduces backpressure, further improving engine breathing and unlocking additional power. A good exhaust system will also enhance the sound of your G35, giving it a more aggressive and sporty tone. Some of the top exhaust brands for the G35 include GReddy, Invidia, and Tanabe. When choosing an intake or exhaust system, it's important to consider the overall design, materials, and sound characteristics to ensure it meets your specific needs and preferences. Remember that while these modifications can provide noticeable gains, it's always a good idea to pair them with a proper tune to maximize their potential.

Forced Induction: Supercharger and Turbocharger

For those seeking a significant power boost, forced induction is the way to go. Superchargers and turbochargers are devices that force more air into the engine, resulting in a substantial increase in horsepower and torque. Superchargers are typically belt-driven and provide instant boost, while turbochargers are exhaust-driven and may exhibit some lag. Installing a supercharger or turbocharger on a G35 requires significant modifications, including upgrading the fuel system, engine management system, and potentially the engine internals. This is a complex and expensive undertaking, but the results can be truly impressive. Several companies offer supercharger and turbocharger kits specifically designed for the G35, such as Stillen, Vortech, and Turbonetics. Before considering forced induction, it's crucial to thoroughly research the options, understand the potential risks, and ensure you have the necessary expertise or professional assistance to complete the installation properly. With careful planning and execution, forced induction can transform your G35 into a true performance machine.

Engine Tuning

Engine tuning is a crucial aspect of any performance modification. The factory engine control unit (ECU) is programmed to optimize performance for a stock vehicle. When you start adding aftermarket parts, the ECU may not be able to properly compensate for the changes, leading to suboptimal performance or even potential engine damage. Engine tuning involves reprogramming the ECU to optimize fuel delivery, ignition timing, and other parameters to match the modifications you've made. This can be done using a variety of methods, including reflashing the ECU with a custom tune, using a standalone engine management system, or piggybacking a tuning device onto the factory ECU. Professional tuning is highly recommended to ensure the engine is running safely and efficiently. A qualified tuner will use a dynamometer to measure the engine's output and make precise adjustments to the tune to maximize performance. Proper engine tuning is essential for unlocking the full potential of your modifications and ensuring the long-term reliability of your G35.

Suspension and Handling

Improving the suspension and handling of your 2003 Infiniti G35 sedan can significantly enhance its driving experience. The G35 already handles well from the factory, but there's always room for improvement. Here are some common suspension and handling modifications:

Lowering Springs and Coilovers

Lowering springs replace the factory springs with stiffer and shorter springs, lowering the car's ride height and reducing body roll. This improves handling and gives the car a more aggressive stance. Coilovers are a more advanced suspension upgrade that replaces the entire spring and shock absorber assembly with an adjustable unit. Coilovers allow you to fine-tune the ride height, damping, and rebound characteristics of the suspension, providing a greater degree of control over the car's handling. Popular brands for lowering springs and coilovers include Eibach, H&R, Tein, and BC Racing. When choosing lowering springs or coilovers, it's important to consider the desired ride height, spring rates, and damping characteristics to ensure they match your driving style and preferences. Keep in mind that lowering the car too much can negatively impact ride quality and increase the risk of scraping on speed bumps and other obstacles.

Sway Bars and Strut Tower Braces

Sway bars, also known as anti-roll bars, connect the left and right wheels of the suspension and help to reduce body roll during cornering. Upgrading to thicker sway bars can significantly improve the car's handling and stability. Strut tower braces connect the strut towers in the engine bay, improving chassis stiffness and reducing flex during cornering. This results in more precise steering and improved handling. Popular brands for sway bars and strut tower braces include Hotchkis, Stillen, and Tanabe. Installing sway bars and strut tower braces is a relatively simple and inexpensive way to improve the handling of your G35. These modifications are particularly effective when combined with lowering springs or coilovers.

Brakes

Upgrading the brakes is an essential modification for any performance car. The factory brakes on the G35 are adequate for normal driving, but they may not be sufficient for spirited driving or track use. Upgrading to larger rotors, more aggressive brake pads, and stainless steel brake lines can significantly improve braking performance. Big brake kits, such as those offered by Brembo and StopTech, provide even greater stopping power. When choosing brake components, it's important to consider the intended use of the car. For street use, a set of high-performance brake pads and stainless steel brake lines may be sufficient. For track use, a big brake kit is highly recommended. Proper brake maintenance, including regular fluid flushes and pad replacements, is also crucial for ensuring optimal braking performance.

Exterior and Interior Modifications

Visual modifications are a great way to personalize your 2003 Infiniti G35 sedan and make it stand out from the crowd. Here are some popular exterior and interior modifications:

Body Kits and Spoilers

Body kits typically consist of a front bumper, rear bumper, and side skirts, giving the car a more aggressive and sporty appearance. Spoilers are aerodynamic devices that are designed to reduce lift and improve stability at high speeds. There are a wide variety of body kits and spoilers available for the G35, ranging from subtle to extreme. Popular brands include VIS Racing, Duraflex, and Stillen. When choosing a body kit or spoiler, it's important to consider the overall style of the car and ensure that the parts fit properly. Professional installation is recommended to ensure a seamless and high-quality finish.

Wheels and Tires

Upgrading the wheels and tires is one of the most impactful visual modifications you can make to your G35. Larger diameter wheels and lower profile tires can dramatically improve the car's appearance and handling. There are a wide variety of wheel styles and finishes available, so you can easily find a set that matches your personal taste. Popular wheel brands include Enkei, Volk Racing, and Work. When choosing wheels and tires, it's important to consider the car's fitment, the desired ride quality, and the intended use of the car. Proper tire inflation and regular tire rotations are also crucial for ensuring optimal performance and longevity.

Interior Enhancements

Interior modifications can enhance the comfort, style, and functionality of your G35. Popular interior modifications include aftermarket seats, steering wheels, shift knobs, and floor mats. Upgrading the audio system is also a common modification. You can replace the factory speakers, add a subwoofer, or install a new head unit with advanced features. Other interior enhancements include custom gauge clusters, carbon fiber trim, and LED lighting. When choosing interior modifications, it's important to consider your personal preferences and ensure that the parts are compatible with your car. Professional installation is recommended for more complex modifications, such as audio system upgrades.

Conclusion

Modifying a 2003 Infiniti G35 sedan is a rewarding experience that allows you to personalize your ride and enhance its performance and aesthetics. Whether you're looking to boost power, improve handling, or simply give your car a unique look, there are countless possibilities. By carefully researching the options, planning your build, and seeking professional assistance when needed, you can create a G35 that is truly your own. Remember to prioritize safety and reliability throughout the modification process. With the right modifications, your 2003 Infiniti G35 sedan will turn heads wherever you go.