Upgrading the exhaust system on your 2007 Lexus IS350 is a popular modification that can improve its performance, sound, and appearance. A cat-back exhaust system replaces the exhaust components from the catalytic converters to the exhaust tips, offering a balance of performance gains and reasonable installation effort. This guide will walk you through everything you need to know about choosing and installing a cat-back exhaust system for your 2007 Lexus IS350.

Why Upgrade to a Cat-Back Exhaust System?

Before diving into the specifics, let's explore why you might want to upgrade your Lexus IS350's exhaust system in the first place. Here are some key benefits:

• Enhanced Performance: A less restrictive exhaust system allows the engine to breathe more freely, which can result in increased horsepower and torque. The 2007 Lexus IS350 can particularly benefit from this, as the stock exhaust system is designed more for quietness than outright performance.
• Improved Sound: One of the most common reasons for upgrading the exhaust is to achieve a more aggressive and sporty sound. A cat-back system can provide a deeper, richer exhaust note without being excessively loud or intrusive.
• Aesthetic Appeal: Many aftermarket cat-back systems come with polished stainless steel exhaust tips, which can enhance the visual appeal of your car's rear end. This is a subtle but effective way to customize your vehicle's appearance.
• Weight Reduction: Some aftermarket exhaust systems are made from lighter materials like stainless steel or titanium, which can reduce the overall weight of the car. While the weight savings might not be dramatic, every little bit helps with performance.

Choosing the Right Cat-Back Exhaust System

Selecting the right cat-back exhaust system for your 2007 Lexus IS350 involves considering several factors, including sound preference, budget, and desired performance gains. Here's a breakdown of what to look for:

Sound Level and Tone

The sound is often the most important factor for many enthusiasts. Do you want a deep, throaty rumble or a high-pitched, raspy exhaust note? Research different brands and listen to sound clips online to get an idea of how each system sounds. Keep in mind that sound is subjective, so what sounds good to one person might not appeal to another. Exhaust sound is also affected by other modifications to your car, such as headers or intake.

Material and Build Quality

The material used in the exhaust system affects its durability, weight, and appearance. Stainless steel is a popular choice for its corrosion resistance and relatively light weight. Titanium is even lighter but also more expensive. Aluminized steel is a more affordable option but is more prone to rust. Ensure the system is well-built with quality welds and sturdy hangers.

Pipe Diameter and Design

The diameter of the exhaust piping affects the exhaust flow and, consequently, the performance of the engine. A larger diameter pipe generally allows for better exhaust flow, but going too large can actually reduce low-end torque. The design of the system, including the bends and routing, also plays a role in performance. Mandrel-bent pipes are preferred because they maintain a consistent diameter throughout the bend, minimizing flow restriction.

Brand Reputation and Reviews

Stick with reputable brands that have a proven track record of producing high-quality exhaust systems. Read online reviews and forums to get feedback from other Lexus IS350 owners who have installed the system you're considering. This can provide valuable insights into the fitment, sound, and overall satisfaction with the product.

Price

Cat-back exhaust systems can range in price from a few hundred dollars to over a thousand dollars. Set a budget and stick to it. Keep in mind that the cheapest option is not always the best, as it may sacrifice quality or performance. Factor in the cost of installation if you're not planning to do it yourself.

Popular Cat-Back Exhaust Systems for the 2007 Lexus IS350

Here are a few popular options that are well-regarded in the Lexus community:

• Invidia Q300: Known for its refined sound and high-quality construction, the Invidia Q300 offers a balance of performance and comfort. It's a popular choice for those who want a sporty exhaust note without excessive drone.
• Tanabe Medalion Touring: The Tanabe Medalion Touring exhaust is designed for a smooth and quiet sound, making it a great option for daily drivers. It offers a subtle increase in exhaust flow without being overly aggressive.
• Borla Exhaust Systems: Borla offers several options for the IS350, ranging from the more aggressive ATAK system to the milder Touring system. Borla is known for its high-quality materials and craftsmanship.
• ARK Performance Exhaust Systems: ARK Performance exhaust systems are designed for both performance and sound. They offer a more aggressive tone and are built with high-quality materials.

Installation Guide

Installing a cat-back exhaust system on your 2007 Lexus IS350 is a relatively straightforward process that can be done with basic tools. However, if you're not comfortable working on cars, it's best to have a professional install it for you.

Tools and Materials Needed

• Socket set
• Wrench set
• Penetrating oil
• Jack and jack stands
• Rubber exhaust hangers
• New gaskets (if needed)
• Torque wrench

Step-by-Step Installation

1. Prepare the Car: Jack up the car and secure it with jack stands. Make sure the car is stable before proceeding.
2. Loosen the Bolts: Spray penetrating oil on the bolts connecting the stock exhaust system to the catalytic converters. Let it soak for a few minutes to make the bolts easier to remove.
3. Remove the Old Exhaust: Use a socket or wrench to remove the bolts connecting the exhaust system. Start from the rear and work your way forward. Be careful when removing the exhaust, as it can be heavy. Disconnect the exhaust hangers by either prying them off with a tool or using pliers to compress the rubber.
4. Install New Gaskets: Inspect the old gaskets and replace them if necessary. Install the new gaskets between the catalytic converters and the new exhaust system.
5. Install the New Exhaust: Align the new exhaust system with the catalytic converters and bolt it into place. Make sure all the connections are secure. Reattach the exhaust hangers, ensuring the exhaust system is properly supported.
6. Tighten the Bolts: Use a torque wrench to tighten all the bolts to the manufacturer's specifications. This is important to ensure a proper seal and prevent leaks.
7. Check for Leaks: Start the car and listen for any exhaust leaks. If you hear or feel any leaks, tighten the bolts further or inspect the gaskets.
8. Lower the Car: Once you're satisfied that the exhaust system is properly installed and there are no leaks, lower the car.

Tips for a Smooth Installation

• Use Penetrating Oil: Penetrating oil is your best friend when dealing with rusty or stubborn bolts. Apply it liberally and let it soak for a few minutes before attempting to remove the bolts.
• Support the Exhaust: Use jack stands or straps to support the exhaust system while you're working on it. This will prevent it from falling and causing damage.
• Inspect the Hangers: Check the exhaust hangers for wear and tear. Replace them if necessary to ensure the exhaust system is properly supported.
• Take Your Time: Don't rush the installation process. Take your time and double-check your work to ensure everything is properly installed.

Post-Installation Checks and Maintenance

After installing the cat-back exhaust system, there are a few things you should do to ensure everything is working properly:

• Check for Leaks: As mentioned earlier, check for exhaust leaks by listening for any unusual noises or feeling for exhaust gases escaping from the connections.
• Monitor Performance: Pay attention to how the car performs after the installation. You should notice an improvement in throttle response and potentially a slight increase in power.
• Listen for Drone: Some exhaust systems can produce drone, which is a low-frequency humming noise that can be annoying on long drives. If you experience drone, you may want to consider adding resonators or sound-deadening materials to the car.
• Regular Inspections: Periodically inspect the exhaust system for any signs of damage or corrosion. Replace any worn or damaged components as needed.

Conclusion

Upgrading the cat-back exhaust system on your 2007 Lexus IS350 is a worthwhile modification that can improve its performance, sound, and appearance. By choosing the right system and following the installation guide, you can enjoy the benefits of a more aggressive exhaust note and potentially increased power. Remember to prioritize quality and take your time during the installation process to ensure everything is done correctly. Whether you're looking for a subtle upgrade or a more aggressive sound, there's a cat-back exhaust system out there for your Lexus IS350.

Disclaimer: Always consult with a professional mechanic if you are unsure about any part of the installation process. Modifying your vehicle may affect its warranty.