The Nissan 370Z is a celebrated sports car, delivering a thrilling balance of performance and style straight from the factory. However, for many enthusiasts, the journey doesn’t end there. Upgrading the exhaust system is one of the most rewarding modifications you can make, and the ARC Titanium Exhaust stands out as a premium choice. Not only does it shed significant weight compared to the stock steel system, but it also unlocks a deeper, more aggressive exhaust note and can contribute a genuine increase in horsepower—often reported in the range of 15–20 hp at the wheels with a proper tune. This comprehensive guide will walk you through every step of the installation process, from preparation to final startup, ensuring a smooth upgrade that transforms your 370Z’s character.

What You Will Need: Tools and Materials

Before you begin, gather all necessary tools and components. Having everything on hand prevents interruptions and ensures a safe, efficient installation.

Components

  • ARC Titanium Exhaust System – confirm the kit includes all pipes, hangers, gaskets, and hardware. Many ARC systems come with high-flow downpipe or cat-back sections; verify compatibility with your 370Z model year.
  • Replacement gaskets – even if provided, having a spare set of OEM-quality exhaust gaskets is wise for the catalytic converter flange.
  • Anti-seize compound – apply to bolt threads to prevent seizing at high temperatures.

Tools

  • Socket wrench set – metric sizes (10mm, 12mm, 14mm, 17mm) are typical for exhaust bolts and hanger studs.
  • Torque wrench – a ½-inch drive torque wrench capable of 20–80 ft-lb is essential for proper fastening.
  • Jack and jack stands – a low-profile floor jack and two sturdy jack stands rated for at least 3 tons.
  • Penetrating oil (e.g., PB Blaster or WD-40 Specialist) – soak rusted bolts 30 minutes before removal.
  • Safety glasses and mechanic gloves – protect against debris and sharp edges.
  • Shop towels and a drop pan – for wiping residue and catching any drips.
  • Optional: O2 sensor socket – if you need to relocate sensors for a full system swap.

Preparation Steps: Setting Up for Success

Proper preparation reduces risk and speeds the actual work. Follow these steps carefully.

  1. Park on level ground – ensure the parking brake is engaged and chock the front wheels.
  2. Cool down the exhaust – if the car has been driven, let it sit for at least an hour. Hot exhaust components can cause burns and make bolts expand, complicating removal.
  3. Disconnect the battery negative terminal – this prevents accidental electrical shorts, especially if you’ll be working near O2 sensor wiring.
  4. Jack up the rear – use the factory jack points (the reinforced pinch welds behind the front wheels and ahead of the rear wheels). Lift the rear enough to slide jack stands safely under the subframe or designated lift points.
  5. Spray penetrating oil – apply to all exhaust flange bolts and hanger studs. Let it soak for 15–30 minutes while you organize your tools.

Removing the Stock Exhaust System

Removing the original exhaust is often the most time-consuming part, especially on older 370Zs with corrosion. Work methodically.

Loosen the Flange Bolts

  1. Locate the two bolts connecting the rear section of the exhaust to the catalytic converter (or the Y-pipe, depending on configuration).
  2. Use a 14mm socket and breaker bar to break them loose. If bolts are stubborn, reapply penetrating oil and tap the flange gently with a hammer to break the rust seal.
  3. Remove the bolts completely and set them aside; you will not reuse them (use new hardware from the ARC kit).

Detach the Exhaust Hangers

  • The 370Z exhaust is suspended by rubber isolators. Use a flathead screwdriver or a dedicated exhaust hanger removal tool to pry each rubber mount off the hanger studs. There are typically four to six hangers along the rear section.
  • Work from the rear forward, supporting the exhaust as you go. A second person is helpful but not essential with a jack or exhaust stand.

Lower the Stock Exhaust

  1. Once all bolts and hangers are free, carefully lower the exhaust. It is heavy (approximately 30–40 lbs for the stock cat-back). Slide it out from under the vehicle and store it away from your work area.
  2. Inspect the old gaskets – they should be replaced entirely. Clean the mating surfaces on the catalytic converter flanges with a wire brush and rag to remove old gasket residue and rust.

Installing the ARC Titanium Exhaust

With the stock system removed, you’re ready to install the much lighter ARC Titanium setup. Titanium exhausts require careful handling—avoid scratching the surface, as it can lead to discoloration over time.

Pre-Assembly Checks

  • Lay out all ARC components and verify they match the 370Z layout. Some kits include multiple slip-fit sections; test the fit loosely before tightening anything.
  • Apply a thin layer of anti-seize to all bolt threads and to the inner surface of any slip joints (if not using a gasket).
  • Place new gaskets on the catalytic converter flanges, ensuring they align correctly.

Mounting the Exhaust

  1. Position the front section – align the ARC downpipe or mid-pipe with the catalytic converter flange. Loosely install the bolts (finger-tight) to allow movement.
  2. Connect the rear section – slide the axle-back or rear muffler section into the mid-pipe. Use the supplied clamp or slip-joint connection. Ensure the exhaust tips are centered in the rear bumper cutouts.
  3. Attach the hangers – push the rubber isolators onto the ARC hanger studs. Sometimes titanium hangers are slightly different in diameter; lubricate with a bit of soapy water if needed.
  4. Torque all bolts – tighten the flange bolts to the manufacturer’s specification (typically 32–38 ft-lb for exhaust nuts). For slip joints, follow ARC’s instructions; many use a band clamp tightened to 40–50 ft-lb.
  5. Recheck alignment – with everything snug, verify the exhaust does not contact the underbody, sway bar, or driveshaft. Leave a gap of at least ¼ inch around all moving parts.

Final Checks and Start-Up

After installation, a systematic inspection ensures everything is safe and leak-free before you drive.

Visual and Torque Inspection

  • Double-check every bolt and clamp for tightness. Heat cycles can loosen connections, so it’s wise to re-torque after the first 50 miles.
  • Inspect all hangers to ensure they are fully seated and not twisted.
  • Wipe down the titanium surface with a clean microfiber cloth to remove fingerprints and oil—these can cause permanent blue spots when the exhaust heats up.

Leak Test

  1. Lower the vehicle from the jack stands.
  2. Reconnect the battery negative terminal.
  3. Start the engine and let it idle. Listen for any hissing or chuffing sounds, which indicate a leak. Place a gloved hand near each joint (careful—parts get hot quickly) to feel for escaping air.
  4. If a leak is detected, tighten the offending connection or replace the gasket. Small leaks can be sealed with high-temperature exhaust sealant, but proper mechanical fit is better.

Sound Check and Heat Cycle

With the car running, enjoy the new tone. An ARC Titanium Exhaust typically starts with a deeper rumble at idle and a crisp, aggressive note under acceleration. Drive gently for the first 15 minutes to allow the titanium to heat cycle and the gaskets to seat. Avoid full-throttle runs until after the re-torque at 50 miles.

Benefits of the ARC Titanium Exhaust

The upgrade offers more than just a sound improvement. Here is a detailed breakdown of the advantages.

Weight Reduction

Titanium is roughly 45% lighter than stainless steel and about 60% lighter than the factory mild steel system. The ARC exhaust saves approximately 15–20 pounds compared to stock—a meaningful reduction that improves acceleration and handling, especially when combined with other weight-saving modifications.

Horsepower Gains

By reducing backpressure and improving exhaust flow, the ARC system can unlock 10–20 hp at the wheels on a normally aspirated 370Z. The exact gain depends on your engine’s condition, supporting mods (such as an intake and tune), and the specific ARC configuration (cat-back vs. full turbo-back). Many owners report peak gains around 15 hp, with the torque curve shifting earlier. For a stock 370Z, this is a noticeable increase that makes the car feel livelier from 3,000 rpm to redline. (See Z1 Motorsports for dyno charts on aftermarket exhausts.)

Sound Character and Quality

Titanium produces a uniquely pure, high-frequency note that is less metallic than stainless steel. The ARC exhaust is engineered to be aggressive without being obnoxious—no drone at highway speeds, yet a snarling growl when you step on it. The weight savings also contribute to a brighter exhaust note because the system resonates differently.

Durability and Heat Management

Titanium has an exceptionally high melting point (over 3,000°F) and resists thermal fatigue and corrosion. It does not rust, making it ideal for climates with road salt or high humidity. Additionally, titanium dissipates heat faster than stainless steel, helping to reduce underhood temperatures and protecting nearby components.

Maintenance and Care

To keep your ARC Titanium Exhaust looking and performing its best, follow these simple guidelines.

  • Cleaning: Wash only with mild soap and water. Avoid abrasive pads that can scratch the thin oxide layer. Over time, titanium will develop a subtle gold/blue heat stain near the headers or muffler tips—this is normal and desirable. To restore the original silver finish, use a dedicated titanium cleaner like FLITZ polish.
  • Re-torque bolts: After the first 100 miles, check all bolts and clamps. Exhaust systems settle, and titanium expands slightly differently than steel.
  • Inspect hangers: Rubber isolators can wear out; replace them every two to three years to prevent the exhaust from sagging.
  • Avoid pressure washers: Direct high-pressure water can force moisture into slip joints and lead to premature wear.

Conclusion

Installing an ARC Titanium Exhaust on your Nissan 370Z is one of the most impactful modifications you can perform. The process, while requiring methodical work and proper tools, is manageable for a weekend enthusiast with basic mechanical skills. The rewards are immediate: a lighter, better-sounding car that responds more eagerly to throttle inputs and delivers measurable horsepower gains. By following the detailed steps outlined in this guide—preparation, careful removal of the stock system, precise installation, and proper break-in—you’ll enjoy a superior driving experience for years to come. For further information, consult the 370Z factory service manual for torque specifications and the ARC exhaust official site for product details and warranty information.