Introduction

The S62 engine, found in the BMW E39 M5 and Z8, is already a masterpiece of engineering—a 4.9-liter V8 that delivers 394 horsepower from the factory. Yet even the best engines can benefit from thoughtful modification, and a Tubi exhaust system is one of the most rewarding upgrades you can make. This Italian-made exhaust not only transforms the sound of the S62 into something more aggressive and soulful but also unlocks a verified 15 horsepower gain at the wheels. In this comprehensive guide, we’ll cover everything you need to know about the Tubi exhaust for the S62, including the engineering behind the power increase, a detailed installation walkthrough, and what to expect in terms of sound, fitment, and long-term durability. Whether you’re a seasoned DIY mechanic or a driver who simply wants the best for your M5, this article will help you decide if a Tubi exhaust is the right upgrade for your S62.

The S62 Engine – A Perfect Candidate for Exhaust Upgrades

Before diving into the specifics of the Tubi exhaust, it’s worth understanding why the S62 responds so well to an improved exhaust system. The factory exhaust on the E39 M5 was designed with a balance of noise regulations, weight constraints, and cost targets. The stock system uses heavily baffled resonators and a restrictive muffler that creates significant back pressure. While this keeps the cabin quiet during highway cruising, it also restricts the engine’s ability to expel exhaust gases efficiently. The S62’s high-compression pistons and VANOS variable valve timing already produce strong low-end torque, but the exhaust bottleneck limits peak horsepower, especially in the upper rpm range. By replacing the stock exhaust with a free-flowing Tubi system, you allow the engine to breathe out as well as it breathes in. The result is not only a higher power peak but also a cleaner, more linear torque curve that makes the car feel sharper across the entire rev range.

Why Tubi?

Tubi Style, based in Bologna, Italy, has been manufacturing high-performance exhaust systems for over 30 years. The brand is best known for its work on exotic cars—Ferrari, Lamborghini, Maserati—but their line for the S62 is a testament to their expertise in tuning large-displacement V8s. Each Tubi exhaust is handcrafted from T304 stainless steel and uses a unique “Rombi” resonator design that produces a distinctive, deep tone without the metallic rasp common in cheaper exhausts. The system weighs roughly 12 pounds less than the factory exhaust, thanks to the use of thinner-wall tubing and a compact muffler design. That weight savings might seem small, but it’s unsprung mass removed from the rear of the car, improving suspension response. More importantly, the Tubi exhaust is engineered to provide optimal exhaust gas velocity, which minimizes back pressure while maintaining enough back pressure for good low-end torque. This is why the 15 hp gain is achievable without sacrificing daily driveability.

Dyno-Proven Gains: 15 HP and Beyond

Independent dyno tests of the Tubi exhaust on the S62 consistently show gains of 12 to 16 horsepower at the wheels, with most owners reporting a solid 15 hp peak gain around 6,200 rpm. On a naturally aspirated engine like the S62, that’s a 4% improvement, which is significant from a bolt-on exhaust alone. The torque curve also flattens out, with gains of 8–10 lb-ft in the mid-range where you feel it most during everyday driving. It’s important to note that these numbers are achieved with a completely stock engine—no remap, intake, or other modifications. Combine the Tubi exhaust with a tune or an intake, and the gains compound. For those who want to verify the results, RHD Japan publishes independent dyno charts from their installations, and M5Board.com has a thread with user-submitted before/after data. The improvement isn’t just a butt-dyno feeling; it’s measurable and repeatable.

Installation Guide: Installing the Tubi Exhaust on Your S62

Installing a Tubi exhaust on the S62 is a weekend job for an experienced home mechanic and a one-afternoon affair at a shop. The system is a direct bolt-on replacement—it uses the same mounting points as the OEM exhaust, so no cutting or welding is required. However, the factory fasteners are often corroded after years of heat cycles, so preparation and the right tools are essential. Below is a detailed, step-by-step guide that covers everything from jacking the car to the final test drive.

Tools and Preparation

Before you get under the car, assemble the following tools and supplies:

  • 3/8” and 1/2” socket sets with extensions (10mm, 13mm, 18mm sockets)
  • Combination wrench set (13mm, 15mm, 18mm)
  • Breaker bar for stubborn bolts
  • Penetrating oil (e.g., WD-40, PB Blaster)
  • Jack and two jack stands (minimum 3-ton capacity)
  • Exhaust hanger removal tool or long flathead screwdriver
  • Safety glasses and mechanic’s gloves
  • New exhaust gaskets (included with Tubi kit, but have spares on hand—BMW part no. 11627508847)
  • Torque wrench (25–50 ft-lb range)

Park the car on a level surface, engage the parking brake, and chock the front wheels. Lift the rear of the vehicle by placing the jack under the differential, then secure with jack stands at the designated lift points on the chassis. Never rely on the jack alone.

Removing the Factory Exhaust

Start by applying penetrating oil to all bolts on the exhaust flanges (where the system connects to the headers) and the rubber hanger mounts. Let it soak for at least 10 minutes. Using a 13mm socket, remove the four bolts securing the exhaust pipes to the headers. On cars with high mileage, these bolts can be tight—use a breaker bar if needed, and be careful not to snap a bolt. Once the flanges are free, move to the rear of the car. Locate the four rubber exhaust hangers (two on each muffler) and use the removal tool to pry them off the metal hangers. If you don’t have the tool, slipping a flathead screwdriver between the rubber and the bracket works, but be gentle to avoid tearing the rubber. Support the exhaust with a transmission jack or a helper as you disconnect the last hanger. Lower the stock exhaust carefully and slide it out from under the car. The factory system is heavy—about 45 pounds—so take care not to scratch the bumper or pinch your fingers.

Mounting the Tubi Exhaust

Before installing the Tubi system, inspect the header flanges for any old gasket material. Clean the surfaces with a wire brush and apply a thin layer of anti-seize compound to the new gaskets. Now lift the Tubi exhaust into position. This system is lighter (around 33 pounds), making it easier to maneuver. Start by aligning the front flanges with the header outlets. Install the bolts loosely—do not tighten yet. This allows movement to align the rear hangers. Slide the rubber hangers onto the Tubi hanger rods, ensuring each one seats fully. Once all four hangers are on, tighten the front flange bolts evenly in a cross pattern. Torque specifications: 22–25 ft-lb for the flange bolts (use a torque wrench). For the hanger connection to the chassis, the stock hardware is reused—tighten to 15 ft-lb. Do not overtighten the rubber hangers; they should be snug but not compressed.

Final Checks and Test Drive

Double-check that all fasteners are tight and that the exhaust is centered in the bumper cutout. There should be a uniform gap of about 1/2” on all sides. Start the engine and listen for any exhaust leaks, especially at the header flanges. A paper towel held near the joint can reveal small puffs of air. If you hear a ticking sound, the gasket may be misaligned—shut off the engine and reseat it. If no leaks, let the car idle for five minutes, then rev to 2,000 rpm and hold for a few seconds. The exhaust tone will be deeper immediately, but the sound will change slightly as the muffler pack breaks in over the first 200 miles. Lower the car and take a test drive. Accelerate gently at first to let the system settle, then gradually increase throttle. After the drive, recheck the bolts and hangers. A follow-up torque check after 100 miles is recommended.

Sound Profile and Driving Experience

The Tubi exhaust transforms the S62’s voice from a muted growl to a full-bodied, exotic snarl. At idle, there’s a pronounced deep rumble that hints at the engine’s potential, without being obtrusive. Under partial throttle around town, the exhaust has a rich, muscular tone that reminds you the car is no ordinary sedan. Floor the accelerator and the sound builds to a fierce, high-revving scream above 5,000 rpm, with no drone at cruising speeds. The Tubi “Rombi” resonator is specifically tuned to kill the 1,800–2,200 rpm drone zone that plagues many aftermarket exhausts on the S62. Owners consistently report that the system is livable for daily driving, yet uncompromising when you want to hear the engine sing. The slight weight loss also contributes to a feeling of agility, as the rear unsprung mass is marginally reduced. Overall, the driving experience becomes more visceral without crossing into obnoxious territory.

Maintenance and Longevity

The T304 stainless steel construction of the Tubi exhaust is highly resistant to corrosion, but it still requires basic care. Clean the exterior with a stainless-steel polish every three months to prevent oxidation, especially in regions that use road salt. Check the rubber hangers annually for cracking—the heat from the pipes can degrade them over time. The tubular muffler packing inside the Tubi muffler is designed to last the life of the system, typically 100,000 miles or more. If you ever need to replace a single section, Tubi sells individual components, so a dent or damage doesn’t mean a full system replacement. Many owners on Bimmerfest report systems still performing well after 15 years, a testament to the build quality.

Frequently Asked Questions

Will a Tubi exhaust void my warranty?

If your S62 is still under an aftermarket warranty, the exhaust itself won’t void it, but any damage caused by improper installation could be denied. Always have a reputable shop install the system and keep receipts. The Tubi exhaust is a bolt-on part, so you can also revert to the stock system for warranty claims.

Does the Tubi exhaust pass emissions?

The Tubi exhaust does not include catalytic converters—it replaces everything behind the factory cats. Because the primary catalysts remain in place, the system will pass most OBD-II plug-in emissions tests. However, some states with visual inspections (like California) may reject any aftermarket exhaust system. Check local laws before purchasing.

Is the 15 hp gain noticeable without a dyno?

Yes. Most owners report that the car pulls harder from 4,000 rpm to redline. The torque gain is subtle but real, and the improved sound makes the car feel faster. If you’re looking for a measurable performance upgrade, this is not just a sound mod—it’s a genuine power increase.

Can I install the Tubi exhaust myself?

Yes, if you have basic mechanical skills and a set of hand tools. The most challenging part is removing the old exhaust if the bolts are rusted. Patience with penetrating oil and a breaker bar usually solves that. Expect to spend 2–4 hours for the first-time installation.

Conclusion

The Tubi exhaust for the S62 is one of the most effective and satisfying modifications you can make to an E39 M5 or Z8. It delivers a verified 15 horsepower gain, shaves off over 10 pounds of unsprung weight, and completely transforms the auditory character of the engine. The installation is straightforward for a DIY enthusiast, and the build quality ensures years of trouble-free service. For anyone who wants to elevate their driving experience without sacrificing daily usability, the Tubi exhaust remains the gold standard. To explore the full range of Tubi products, visit the Tubi Style official website. Additional real-world ownership experiences can be found on M5Board’s forums and BimmerPost.