McLaren 720S Race Downpipes vs Stock | Sound, Power & Full Guide
The McLaren 720S with the M840T 4.0-litre twin-turbo V8 is one of the most responsive supercars ever built. From the factory it produces 710 HP and 568 lb-ft of torque, covering 0–60 mph in under 2.9 seconds. But the factory exhaust system is heavily compromised by emissions regulations — restrictive catalytic converters choke exhaust flow and rob the turbos of the spool speed they were engineered for. Upgrading to race downpipes is one of the most effective single modifications you can make to a 720S, unlocking measurable gains in power, torque, and throttle response while delivering an aggressive exhaust note that matches the car's supercar credentials.
Race Downpipes vs Stock Exhaust — What Changes?
The factory 720S exhaust routes spent gases through tightly packed catalytic converters before they exit the turbos. These cats create significant back-pressure, forcing the turbos to work harder and limiting peak airflow. Race downpipes remove (catless) or replace (high-flow) these restrictors, allowing exhaust gases to evacuate the turbos faster. The result is quicker spool, stronger mid-range pull, and higher peak power — typically 30–50 HP on a stock tune, and 60–80+ HP when paired with an ECU recalibration.
| Attribute | Stock Downpipes | Race Downpipes (Catless) |
|---|---|---|
| Catalytic Converters | OEM high-restriction cats | Removed — straight-through flow |
| Back-Pressure | High | Minimal |
| Turbo Spool | Standard | Faster — reduced exhaust restriction |
| Power Gain (stock tune) | Baseline | +30–50 HP |
| Power Gain (with ECU tune) | Baseline | +60–80 HP |
| Exhaust Sound | Refined, quiet | Aggressive, raw V8 note |
| Weight | Heavier (ceramic substrates) | Lighter — reduced rotating mass |
| Best For | Daily driving, emissions compliance | Track use, maximum performance |
McLaren 720S Exhaust Upgrade Options
Choosing the right exhaust upgrade depends on your goals — maximum power, sound character, or a balance of both. Here is how the leading options compare for the M840T platform.
| Product | Type | Material | Power Gain | Price |
|---|---|---|---|---|
| YPG 720S Race Downpipes | Catless downpipes | T304 stainless | +30–50 HP (stock tune) | $2,999.99 |
| 720S Cat Bypass Pipes | Cat bypass / delete | T304 stainless | +25–40 HP | $3,395 |
| Fabspeed Supersport LT Exhaust | Full exhaust system | T304 stainless | +20–35 HP | $3,395 |
| Race Downpipes + Stage 2 ECU | Downpipes + calibration | — | +80–120 HP | From $6,999 |
How Race Downpipes Improve the 720S
The M840T's twin-scroll turbochargers respond immediately to reduced back-pressure. Once race downpipes replace the factory cats, exhaust gases exit the turbine housing faster, allowing the compressor side to build boost more quickly. On the 720S this translates to a noticeably sharper throttle response below 4,000 RPM — the part of the rev range where the factory exhaust restriction is felt most. At higher RPM the gains compound: the turbos sustain peak boost longer into the powerband, and peak power climbs to approximately 740–760 HP on a stock calibration.
The sound transformation is equally significant. The factory 720S is deliberately quiet at low RPM. Race downpipes open up the exhaust note dramatically — you get a deeper, more aggressive V8 bark on startup, a harder-edged tone through the mid-range, and a raw, turbocharged scream at full throttle that is unmistakably supercar.
Pairing Downpipes with an ECU Tune
Race downpipes alone deliver strong gains, but the factory ECU calibration cannot take full advantage of the improved exhaust flow. A Stage 2 ECU tune recalibrates boost targets, fuel maps, and ignition timing to exploit the reduced back-pressure. On the 720S this combination routinely pushes output to 790–830 HP depending on fuel quality and ambient conditions — a 80–120 HP improvement over stock that transforms the car's already brutal acceleration into something genuinely track-weapon fast.
720S Power Levels by Upgrade Stage
| Configuration | Estimated HP | Estimated Torque | Key Modifications |
|---|---|---|---|
| Stock 720S | 710 HP | 568 lb-ft | Factory M840T |
| Race Downpipes Only | 740–760 HP | 600–620 lb-ft | Catless downpipes |
| Stage 2 (Downpipes + ECU) | 790–830 HP | 640–680 lb-ft | Downpipes + Stage 2 calibration |
| Full Exhaust + Stage 2 ECU | 800–840 HP | 650–690 lb-ft | Full exhaust system + calibration |
Installation Considerations
McLaren's carbon-fibre monocoque chassis and mid-engine layout make exhaust work more involved than on a front-engine car. The downpipes sit beneath the engine in a tight package, and access requires careful removal of undertray panels and heat shielding. Professional installation by a shop experienced with McLaren's construction is strongly recommended — incorrect fitment can damage carbon components or trigger exhaust leaks that affect turbo performance. Most installations take 4–6 hours at a specialist facility.
GCC and Hot-Climate Considerations
For 720S owners in the Gulf region, race downpipes offer an additional advantage: reduced under-car heat. The factory catalytic converters generate significant radiant heat — removing them lowers exhaust-system temperatures, which helps the intercooler system maintain charge-air temps in ambient conditions that regularly exceed 45 °C. When paired with an ECU tune calibrated for regional fuel grades (95–98 RON), the 720S responds exceptionally well to the downpipe upgrade even in peak summer conditions.
YPG Motorsport ships worldwide and has completed hundreds of McLaren builds for owners across Kuwait, Saudi Arabia, Qatar, and the UAE.
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