A Complete Guide to Installing and Caring for Aftermarket Parts

If you're a car enthusiast, the idea of customizing your car to align with your unique preferences can be enticing, especially in the aftermarket accessories space. Since it is popular among car enthusiasts, it offers a cost-effective way to enhance the functionality, aesthetics, and overall performance of your vehicle. 

From custom wheels to high-flow exhausts, the options are virtually endless, which is exactly why the aftermarket industry contributes billions to the automotive economy in Australia alone.

However, upgrading your ride is not just about picking the coolest or cheapest part. Proper installation and diligent maintenance are crucial to getting the most out of any modification. A badly fitted cold-air intake or neglected suspension kit can hurt performance or even become a safety hazard. 

In this hands-on guide, we’ll walk you through how to ensure your aftermarket upgrades are installed correctly, cared for regularly, and fully optimized for longevity and safety, so you’re well-equipped to make informed decisions.

Understanding Aftermarket Parts

Before turning the first wrench, it helps to know what aftermarket parts really are and how they differ from OEM parts. If you are still asking questions like what are aftermarket parts? Well, it’s simple: aftermarket car parts and accessories are components made by third-party companies (not your car’s manufacturer) and are also called OEM (original equipment manufacturer) parts.

Aftermarket parts allow car owners to have flexible choices beyond OEM options. You can install them to replace or upgrade original parts, offering customizable options, low cost, and improved performance. 

When modifying or upgrading a car, enthusiasts often explore the world of aftermarket car parts and accessories. But what's their difference with OEMs? Check out our full guide, Everything Car Enthusiasts Should Know About Aftermarket Car Parts and Accessories, where you will explore and better understand the world of manufacturing.

But beyond the basic distinction, aftermarket components span a wide range of categories. Here are some of the most common types of aftermarket upgrades:

1. Performance upgrades: These are parts that boost power, handling, or braking. Think high-flow air intakes, turbochargers, performance brake kits, sport suspensions, or engine tuners. Many enthusiasts use these to push beyond factory performance limits like, for example, adding a cold-air intake and performance exhaust to free up horsepower.
2. Aesthetic modifications: If you’re all about aesthetics then there are mods that change the look or style of your car. This includes body kits, spoilers, custom grilles, alloy wheels, tinted windows, and interior trim pieces. They don’t necessarily make the car faster, but they sure make people turn their heads in your direction.
3. Exhaust upgrades: They usually focus on performance and sound. By reducing backpressure, a quality exhaust system can add horsepower, improve fuel efficiency, and give your car a deeper, sportier tone. Just make sure it complies with local noise and emissions rules. For more on what's legal down under, check out Car Modification Laws Australia
4. Interior upgrades: The interior of your car can be changed to the way you want it to be because interior upgrades are all about comfort and personalization. Popular choices include sport seats, custom steering wheels, infotainment systems, or ambient lighting kits, all of which make your car’s cabin more stylish, modern, and enjoyable to drive.
5. Safety and convenience accessories: Aftermarket parts can also add functionality and safety. For examples: backup cameras and parking sensors, brighter LED headlight bulbs, dash cams, or upgraded infotainment systems. These enhance your driving experience and safety.
6. Off-road and 4x4 gear upgrades: For the adventurers, there are lift kits, all-terrain suspension components, bull bars, roof racks, snorkels, and skid plates. In Australia, the off-road aftermarket is booming, popular utes like the Toyota Hilux and Ford Ranger are often fitted with upgraded suspension, bull bars, roof racks, and powerful spotlights for outback trekking.

Each type of part might require a slightly different installation approach and maintenance routine. But no matter what you’re adding to your car, some preparation beforehand will set you up for success.

Preparation Before Installation

Proper prep is the unsung hero of any successful aftermarket installment. This pre-installation phase is crucial for ensuring a safe, smooth, and successful installation process by minimizing potential issues and delays. Before you grab the toolbox, take some time to get everything in order.

Do Your Research & Confirm Compatibility:

There’s nothing worse than excitedly unboxing a new part, only to find it doesn’t fit your car. So it’s important to always verify that the part is designed for your vehicle’s exact make, model, year, and trim level. Check the product specifications, part numbers, and any fitment notes from the manufacturer. 

When a part is described as “universal,” be extra cautious because universal doesn’t always mean it truly fits everything. If possible, read forums or reviews on Quora or Reddit to see if others with your car have installed it. 

This upfront research prevents headaches down the road. Remember, mixing and matching parts that aren’t made for your model can lead to serious fitment and performance issues.

Choose Quality Brands and Trusted Suppliers:

Not all aftermarket accessory parts are created equal. Stick to reputable brands of premium aftermarket parts that have good reviews or come recommended by professionals like Mars Performance. There will be cheap, no-name parts from unknown sellers that you could choose, but this could lead to poorly made or even counterfeit products. 

In fact, an investigation by the Federal Chamber of Automotive Industries (FCAI) initiative Genuine is Best revealed that dangerous counterfeit car parts are arriving in Australia, and around 62% of the parts purchased in a Test Buy Program were found to be counterfeit. This serves as a reminder to buy from trustworthy sources, and you have to be aware of the parts being fitted to your car.

In an interview, Mr. Weber from FCAI said, “Get your car serviced by your local dealer. They will always use genuine parts. If you go independent, ask the question: Will you use genuine parts, and can I see the receipts please?” So it’s important to be cautious because saving a few dollars isn’t worth the risk of a part failing at 100 kph on the highway.

And most importantly, look for receipts, warranties, or certifications on the product because quality manufacturers often stand by their parts. When in doubt, consult experienced friends or a mechanic for recommendations on reliable brands.

Gather The Right Tools And Set-up A Safe Workspace

Installing aftermarket parts can range from a simple bolt-on job to a complex project. In all cases, you’ll want to have basic tools on hand and a good space to work. At minimum, have a set of quality wrenches/sockets, screwdrivers, pliers, and any specialty tool the part’s instructions call for. 

If you’ll be lifting the car, use proper jack stands on a level surface and never rely on just a jack. Ensure your workspace is well-lit and you have containers for bolts or clips you remove. Using the correct size tools is important; using the wrong tool can strip bolts or damage the new part.

Furthermore, it’s also wise to wear safety gear like gloves and eye protection especially when dealing with fluids or drilling. A little prep here guarantees you won’t be scrambling mid-job because you’re missing a tool.

Read The Instructions And Check For Any Warranty Impacts

Yes, this is the simplest step, but most people forget to do it. Reading the manual or install guide may not be the most exciting part, but it can save you from costly mistakes. Manufacturers often include specific steps, torque settings, or electrical diagrams for a reason.

Skipping these can lead to frustration or broken parts. Also, take note if installing the part could affect your car’s warranty. Generally, under consumer law, using aftermarket parts does not void your car’s warranty. Your warranty stays intact as long as the part itself isn’t the cause of a problem. If you want to learn more, check out our guide on How to Modify Your Car Without Voiding Insurance in Australia: A Guide for Modders to mod safely.

The lesson here is simple: follow instructions diligently, and if you’re unsure about something, consider getting professional help to protect your car and its warranty.

How can I check if an aftermarket part fits my car? Always verify compatibility through the part’s specifications and your vehicle’s details. Match part numbers, read fitment guides, and see if others with your exact model have used it. 

If a part is “universal” or for a range of models, double-check dimensions. Ensuring a part matches your car’s make, model, and year prevents misfit parts that could cause installation headaches or performance issues..

Best Practices for Installation

Alright, now  you’ve got the right part in hand, tools at the ready, and you’ve done your homework. Now for the main event: installing that aftermarket component. Whether you’re a seasoned DIY mechanic or a first-timer, these best practices will help ensure a smooth, safe installation:

1. The roadmap to your installment process is through following the manufacturer’s instructions step by step. It’s worth saying again because it’s so important. The instruction sheet or manual is your best friend. Lay out all the included hardware and make sure you understand the order of operations. 
2. Know when to DIY and when to get professional help. Not every aftermarket install is a do-it-yourself job. Changing out spark plugs or an air filter is one thing; wiring a new digital gauge cluster or installing a lift kit is another. Be honest about your skill level and the complexity of the task. If the instructions mention special tools you’ve never heard of (like a spring compressor or an engine tuning software), or if the job involves critical safety systems (brakes, airbags, etc.), consider having a qualified technician do it. It’s perfectly fine to let the pros handle certain installations, better than a botched job that could compromise your car. 
3. Put safety first throughout the process. This covers a lot: personal safety and vehicle safety. Always disconnect the battery if you’re working on anything electrical (prevent those accidental sparks or blown fuses). Use jack stands and wheel chocks if you’re going under the car. 
4. Keep your work area organized to avoid losing small nuts and bolts. When tightening fasteners, use proper torque specs if provided, over-tightening can strip threads or break bolts, while under-tightening could let parts come loose. Also, avoid shortcuts like skipping bolts or using “close enough” hardware. Every nut, bolt, and clip likely has a purpose (often for your safety or the part’s longevity).
5. If you removed any safety devices like a wheel speed sensor or airbag connector during the instalment, double-check that they are reconnected properly. Think of it this way: take your time now so that you and your car remain safe later.
6. Double-check and test everything after installation. Congratulations, the part is on! But you’re not done quite yet. Before you slam the hood and speed off, do a thorough once-over. Verify that all fasteners are tightened to spec, and nothing is left dangling or rubbing. If it’s a fluid-related part (coolant hose, oil cooler, etc.), start the engine and check for leaks. For electronics, reconnect the battery and ensure all wires are insulated and tied away from moving parts. 
7. A quick test and inspection are a must after installation. When you take the car for a spin, start slow and listen or feel for anything odd. Does that new suspension squeak or clunk? Is the car pulling left or right after installing those lowering springs? If so, you might need to recheck the installation or get an alignment. It’s all about ensuring the part functions correctly and safely before you return to normal driving. A quick test and inspection can catch issues early and give you peace of mind that your upgrade is road-ready.

Get Your Aftermarket Upgrades Installed the Right Way

Upgrading your car with aftermarket parts can be one of the most rewarding aspects of vehicle ownership. You transform a stock machine into something that reflects you—your style, your performance needs, your creativity.

If you want insights on How to Choose the Right Aftermarket Accessories for Your Vehicle, check out our guide to learn what types of aftermarket car parts and accessories fit your needs.

The key to reaping these rewards is proper installation. When you install parts correctly and follow best practices, you set yourself up for success. Your modified components perform better, last longer, and give you more value for your money and effort. Most importantly, you keep your car safe and enjoyable to drive.

Take the time to do things right: research thoroughly, use quality parts, and mind the details during installation. This proactive approach prevents most problems before they start and saves you from the frustration of a failed part or breakdown. Ownership becomes more enjoyable when you know your car is in top shape.

We encourage you to invest in premium aftermarket parts from Mars Performance—not just for performance and looks, but for peace of mind on the road. A well-installed part enhances your car’s capabilities while keeping you and others safe, a true win-win for any car enthusiast or daily driver.

Are you inspired to tackle your next upgrade? If so, and you want parts you can trust, we’re here to help. Explore our curated collection of high-performance aftermarket parts designed for Australian drivers. We’ve hand-picked components that are compliant, reliable, and easy to install, so you can mod your car with confidence. 

Let’s make your dream a reality—one quality part at a time with Mars Performance!