Before diving into whether the 2008 Audi S5 Coupe holds up today, let’s address the elephant in the room: comparisons to the BMW M3 Coupe of the same year. Initially, pitting the all-wheel-drive Audi S5 against the rear-wheel-drive BMW M3 might seem like an uneven match. However, our in-depth testing of the 2008 Audi S5 revealed surprising performance figures. Powered by a 354-horsepower 4.2-liter V8 engine, the Audi S5 clocked a 13.3-second quarter-mile at 104 mph. This is remarkably close to the numbers achieved by the more powerful 420-hp 2007 Audi RS4 sedan. Furthermore, the S5’s slalom speed mirrored that of the RS4, a car known for its track-focused nature. These figures led us to question: with this level of performance from the Audi S5, is the significantly pricier RS4 truly necessary?
Our conviction in the 2008 Audi S5 was so strong that it earned our Editors’ Choice Award. Driven by this enthusiasm, we decided to conduct a head-to-head comparison against the newly V8-powered 2008 BMW M3 Coupe. On paper, the specifications make them seem like direct competitors: the 354-hp, all-wheel-drive 2008 Audi S5 versus the 414-hp, rear-wheel-drive 2008 BMW M3.
However, as our testing unfolded, it became clear that the Audi S5 faced a challenge even greater than we initially anticipated.
Performance Unleashed: Audi S5 on the Track
Were we misguided in comparing these two performance coupes? The performance metrics from our initial 2008 Audi S5 test were no anomaly. In subsequent tests, we consistently extracted similar, if not slightly improved, results from the Ingolstadt-born machine.
Factoring in the 1-foot rollout commonly used in acceleration testing by automotive publications, the all-wheel-drive 2008 Audi S5 surged to 60 mph in a mere 4.7 seconds (or 4.9 seconds without the rollout). It then completed the quarter-mile in 13.2 seconds at 104 mph. Leveraging its exceptional all-wheel-drive traction, we even marginally bettered our previous slalom speed. Our test driver noted the Audi S5’s “rock-solid stability in the slalom, particularly during on-throttle transitions,” highlighting the benefits of its AWD system. This intelligent power distribution propelled the S5 to an impressive average speed of 69.0 mph through the 600-foot slalom course. Lateral acceleration on the skidpad remained a strong 0.91g.
Alt text: The 2008 Audi S5 Coupe demonstrates its all-wheel-drive capability and agility on a test track, showcasing its handling prowess during performance testing.
BMW M3: Setting a New Performance Bar
Switching to the BMW M3 and adapting our driving techniques for its rear-wheel-drive nature, we confirmed BMW’s claims of explosive acceleration. Launching the rear-drive coupe demands finesse, but executed correctly, it results in a 0-60 mph sprint of 4.3 seconds with a 1-foot rollout (4.6 seconds from a standstill). Continuing its relentless charge, the BMW M3 conquered the quarter-mile in 12.7 seconds at 112 mph.
The 2008 BMW M3 is undeniably rapid. These performance figures were once the domain of hypercars like the Chevrolet Corvette Z06, Dodge Viper, or Porsche 911 Turbo.
However, the M3’s capabilities extend beyond straight-line speed. Our test driver remarked, “One of the fastest production cars we’ve tested through the slalom. Maintaining control at the limit is remarkably easy. The steering provides exceptional feel and responsiveness.” A clean slalom run yielded a speed of 73 mph, a record for a mass-production vehicle at the time. On the skidpad, the BMW M3, with its near-perfect 51 percent front/49 percent rear weight distribution and sophisticated electronically controlled rear differential, delivered sports car levels of grip, achieving 0.95g in lateral acceleration.
Alt text: The 2008 BMW M3 Coupe exhibits its superior handling and cornering abilities on a race track, highlighting its balanced chassis and advanced rear differential.
Daily Driving Dynamics: S5’s Effortless Grace vs. M3’s Raw Edge
A week of commuting in both the Audi S5 and BMW M3 revealed a key aspect of the S5’s appeal: its ability to deliver impressive performance without demanding constant driver engagement. Perhaps this is where the Audi would surpass the BMW, we initially thought.
The Audi S5’s clutch engagement is smooth and progressive. The shifter requires moderate effort, and while gear throws are somewhat long, the shifting action remains consistently easy and intuitive, even when rushed. Crucially, the S5’s non-adjustable suspension strikes a commendable balance, offering compliance and suppleness on both city streets and highways. It provides a sporty yet composed ride, avoiding the harshness often associated with dedicated sports cars. While the 2008 Audi S5 feels responsive and eager, it doesn’t feel agitated by the mundane realities of everyday driving.
Furthermore, road surface imperfections have minimal impact on cabin noise levels in the S5, even with its standard 19-inch wheels and low-profile 35-series Dunlop SP Sport Maxx tires. Whether on rough or smooth surfaces, concrete or asphalt, the S5 maintains its composure and quietness. Wind noise, primarily from the side mirrors, does fluctuate with speed and crosswinds, however.
The 2008 Audi S5’s ability to effortlessly navigate a wide spectrum of driving conditions sets it apart from many contemporary vehicles. However, it also suggests that the 2008 Audi S5 leans more towards the grand touring category than being an outright, hardcore sports car.
The M3’s Uncompromising Character
Stepping into the BMW M3 immediately conveys a sense of heightened purpose. This isn’t necessarily apparent from the clutch pedal’s firm but manageable feel, or the effortless gear selection typical of BMWs. Instead, the taut ride quality is the primary indicator of the M3’s focused nature.
Our 2008 BMW M3 Coupe was equipped with optional 19-inch forged wheels and Electronic Damping Control (EDC), available as a standalone option or within the Technology Package. BMW’s EDC provides three distinct damping settings: Comfort (livable), Normal (firm), and Sport (track-only).
In our assessment, the 2008 BMW M3’s Comfort setting approximates the ride firmness of a BMW 3 Series with a Sport Package suspension. In this softest mode, road imperfections are noticeable, but only the most severe become jarring. The Normal setting introduces ride harshness comparable to a 2007 Porsche 911 GT3 – a car forgiven for its firmness due to its exceptional track performance. Sport mode is truly track-focused, proving too stiff for anything but perfectly smooth surfaces.
For acceleration testing, Comfort mode was used for optimal rear-wheel traction. Normal mode was employed for the slalom, and Sport for the skidpad, given its relatively flat surface. While we didn’t test an M3 without EDC, it appears to be a worthwhile addition.
Even in Comfort mode, the M3’s Michelin Pilot Sport PS2 tires audibly slapped the road surface, transmitting tire roar into the cabin. Conversely, the M3’s advanced aerodynamics, evident in its side mirror design, resulted in remarkably low wind noise.
Engine Prowess: V8 Symphony
Prior to experiencing the 2008 BMW M3’s V8, we held Audi’s 4.2-liter V8 in high regard. With its snarling, multi-octave exhaust note, broad powerband, and eagerness to rev to its 7,000-rpm redline, we questioned how a V8 engine could be significantly better.
The BMW’s all-new 414-hp 4.0-liter V8 answered that question emphatically. It boasts a broader torque plateau and a higher operating range, delivering a substantial 85 hp advantage from around 5,000 rpm all the way to its 8,400-rpm redline.
In terms of auditory pleasure, the Audi earns points for its more alluring exhaust sound. However, for sheer power output across the rev range, the BMW engine takes the crown. Unlike the V10 in the M5 (on which the M3’s engine is based), this V8 exhibits no torque deficiency, feeling robust and responsive at any engine speed.
Dynamometer testing further illustrated why the Audi garnered our respect, while the track-focused BMW exceeded our expectations.
Alt text: A detailed view of the 2008 Audi S5 Coupe’s engine bay, highlighting the powerful 4.2-liter V8 engine, a key component of its performance capabilities.
Interior and Features: Refined Cockpits
Both interiors exude an exclusive ambiance befitting purpose-built performance cars. They feature easily readable gauges, prominent tachometers, and supportive, adjustable sports seats. Satellite navigation interfaces are high-tech, and audio systems are suitably premium (Harman Kardon/Logic7 in the BMW and Bang & Olufsen in the Audi). While impeccably crafted, the BMW M3’s interior hints at a general BMW design language that was beginning to appear somewhat austere and due for a refresh. The Audi’s interior, in contrast, presents a more visually engaging and arguably more interesting design.
Both cars incorporate their own menu-driven control knobs for infotainment systems. However, Audi’s MMI system demonstrates that BMW’s iDrive remains the most frustrating electronics interface ever made mandatory by a manufacturer. While familiarity has lessened the initial aggravation over time, moments of frustration still arise.
Rear seating is surprisingly adequate in both four-passenger coupes, although the BMW offers a noticeable edge in headroom. Accessing the rear seats past the motorized front seats is also easier in the M3, thanks to a grab handle on the headliner. The BMW’s automatic seatbelt extender was also a welcome feature, whereas the Audi still relies on a less convenient reach-and-grab approach.
The Verdict: M3 Takes the Crown, S5 Remains a Strong Contender
Included in the BMW M3’s optional Technology package is the seemingly unassuming M Drive button. This button is transformative, allowing drivers to save their preferred settings for suspension dampers, throttle mapping, steering effort, and stability/traction control intervention levels. A press of the button instantly configures the M3 for a pre-defined performance driving mode. These settings can even be programmed to individual ignition keys to suit different drivers.
While skilled drivers might disable all electronic aids on the M3 for track use, the M Dynamic Mode for stability control proves particularly useful on public roads. It permits enough wheelspin for thrilling yaw angles before intervening, creating the illusion of exceptional driving skill even when M Dynamics is subtly assisting.
The Audi S5 features a similar three-stage stability control system, also effective for spirited driving while maintaining a safety net. However, inducing tail-out antics is far less attainable in the all-wheel-drive Audi S5. In an attempt to mitigate the inherent understeer tendencies of its 60 percent front/40 percent rear weight distribution, the S5 directs 40 percent of power to the front and 60 percent to the rear, aiming to emulate rear-wheel-drive balance.
This approach works to a degree. However, physics prevails, and the nose-heavy S5 will exhibit understeer at the limit, albeit less pronounced than most Audis, save for the mid-engine R8.
We deeply appreciate the 2008 Audi S5. Its elegance, understated performance, and relative value are compelling. Nevertheless, the more extroverted 2008 BMW M3 Coupe emerges as the victor, due to its undeniable track dominance and surprising everyday usability. On a track day or spirited drive, the Audi S5 begins to feel somewhat out of its element compared to the M3.
The new 2008 BMW M3 possesses a breadth of capabilities few cars can match. In normal driving, it behaves like any other BMW 3 Series. However, when pushed, the M3 transforms into a 400-hp hypercar. The M3 rewards aggressive driving, whereas the S5 is more forgiving but less rewarding at the extremes.
BMW has effectively imbued this everyday coupe with the feel of a low-volume specialty car like the Porsche 911, but at a significantly lower price point. The M3 coupe raises the question of what BMW could achieve if they were to develop a mid-engine sports car to rival the Audi R8.
Admittedly, the 2008 BMW M3’s styling is somewhat polarizing. Its carbon-fiber roof and hood bulge are distinctive, but perhaps not universally admired. However, our unwavering enthusiasm for the M3’s driver connection overshadows any minor aesthetic reservations. The 2008 Audi S5 Coupe remains a compelling choice, particularly for those prioritizing all-weather capability and a more relaxed driving experience, but for ultimate performance and driver engagement, the BMW M3 Coupe of 2008 takes the win in this classic coupe comparison.
