For four decades, the BMW M5 has defined a very specific idea: the sedan that needs no excuses. Room for four adults, a trunk that swallows a family’s weekend, and performance that embarrasses dedicated sports cars — all in a package subtle enough to pass unnoticed in a school pickup line. The M5 Competition is that idea taken to its sharpest recent expression, and for buyers near Natick, a properly maintained example represents one of the great performance-per-dollar opportunities in today’s used market.
The place to find one is Acton Auto Boutique at 429 Great Rd in Acton — an enthusiast-owned independent dealership whose inventory has long centered on exactly this kind of car. BMW M products are core stock here, the on-site Acton Autowerks service facility carries factory BMW diagnostic equipment, and every vehicle is prepared and documented to a standard that gives the phrase “great condition” a verifiable meaning. When the subject is a 617-horsepower sedan, that standard is not a nicety. It is the whole purchase.
What Makes a Competition Different from an M5
The Competition badge on an F90-generation M5 is not a trim line or an appearance package. BMW’s M division re-engineered the car around a sharper brief. Output from the 4.4-liter S63 twin-turbocharged V8 rises to 617 horsepower — 17 more than the standard M5 — with 553 lb-ft of torque available across a plateau so broad the car feels inexhaustible in every gear. The chassis changes are the deeper story: the Competition sits 7 millimeters lower on stiffer springs, the engine mounts are firmer to sharpen throttle response and driveline precision, front camber increases for harder cornering bite, the rear anti-roll bar stiffens, and the dampers are retuned around all of it. A Competition-specific sports exhaust and standard 20-inch wheels complete the specification.
The cumulative effect is an M5 with noticeably more edge — keener turn-in, flatter cornering, a harder-hitting soundtrack — without surrendering the everyday civility that makes the M5 concept work. It is the version enthusiasts sought when new, and it is the version worth seeking now.
The Numbers, and What They Feel Like
The specs read like a supercar’s. Zero to 60 mph takes 3.1 seconds by BMW’s own conservative claim — independent testing has recorded quicker — on the way to a top speed of 155 mph, or 190 with the M Driver’s Package. The 8-speed M Steptronic transmission fires shifts with near dual-clutch immediacy while remaining silken in traffic. And the M xDrive all-wheel-drive system is the piece that transforms the car for Massachusetts life: it delivers the traction that puts all 617 horses to the road on a cold, damp morning, defaults to a rear-biased character that keeps the chassis playful, and can be switched to pure rear-wheel drive when the driver wants the classic M5 experience undiluted.
The braking hardware matches the rest — massive compound rotors as standard, with the optional M carbon ceramic system (identifiable by its gold calipers) offering fade resistance that outlasts any public road. Car and Driver’s M5 coverage has repeatedly placed the F90 Competition among the fastest four-door cars the magazine has ever tested, and the significant point for a used buyer is that none of this capability came at the cost of durability: the S63 engine and ZF-based transmission have proven robust when maintained on schedule.
The Cabin: Full Luxury, Zero Compromise
Inside, the Competition is a genuine luxury sedan. M multifunction sport seats trimmed in extended Merino leather hold the driver properly without punishing a long highway run, rear passengers get true full-size-sedan space, and the equipment list on most examples runs deep: head-up display, soft-close doors, ventilated seats, and the superb Bowers and Wilkins Diamond surround system among the common options. The 2021 facelift brought a larger 12.3-inch central touchscreen and refreshed styling, but even the earliest 2019 cars feel thoroughly modern in daily use. This is the car for the Natick commute down Route 9 on Monday and a blast across to the Berkshires on Saturday — with nothing swapped, changed, or tolerated in between.
Model Years: 2019-2023 at a Glance
The F90 M5 Competition ran from the 2019 through 2023 model years, splitting into pre-facelift cars (2019-2020) and LCI facelift cars (2021-2023) with the updated screen, lighting, and lightly revised damper calibration. Mechanically the two are siblings, and a well-kept early car gives away nothing meaningful to a later one — which makes the pre-facelift examples the sharp value in the range. Above the Competition sat the limited 627-horsepower M5 CS in 2022, now a minor collectible, and the current generation moved to hybrid power in 2025 — a shift that has only strengthened enthusiast demand for the pure-V8 F90 Competition.
Condition Is Everything: How to Buy a Great One
An M5 Competition’s value lives in its history. The essentials any buyer should verify: complete service records with on-time oil services for the S63; transmission, transfer case, and rear differential fluid services performed at reasonable intervals given the drivetrain’s outputs; brake measurements, and a careful inspection of the carbon ceramic discs if fitted; matched, healthy tires across the staggered 20-inch set; and current software throughout the iDrive and driver assistance systems. Just as important on this particular car: confirmation that it is running factory calibration. Many M5s were tuned in previous ownership, and an undocumented tune changes the risk profile of the purchase entirely.
This checklist is precisely why buying from Acton Auto Boutique makes sense. Every car the dealership offers is inspected and prepared through Acton Autowerks with factory BMW diagnostic equipment — the tooling that reads these systems the way a BMW dealer’s does — by Master Technicians with more than twenty years of experience. The dealership publishes a multi-point pre-purchase inspection report on its vehicles covering mechanical condition, exterior and interior assessment, and a road test, and it openly welcomes independent inspections by any shop the buyer chooses. A great-condition M5 Competition is not a claim here; it is a documented state, and the service department that verified it remains available to maintain the car for as long as you own it.
Pricing the F90 Competition
Depreciation has done generous work on behalf of the second owner. Cars that stickered between $120,000 and $135,000 well-optioned now trade in clearly defined bands: 2019-2020 Competition examples with average mileage generally run from the low $50,000s to the high $60,000s, while 2021-2023 LCI cars span roughly $70,000 to $90,000 depending on year, mileage, and options. Desirable specifications — carbon ceramics, the Bowers and Wilkins system, Individual paintwork, executive packages — carry real premiums and hold them at resale. At these numbers, nothing else delivers this combination of speed, space, and build quality; the M5 Competition’s only true used-market rivals cost meaningfully more.
Drive One at Acton Auto Boutique
Natick to Acton is about half an hour up Route 27 — a short trip for a car this significant. Check the current inventory for M5 Competition availability; the stock turns regularly, and if the exact specification you want is not on the lot, the team actively sources cars to order. Financing for New England buyers is handled through the online finance application, extended warranty options are offered on every vehicle, and the virtual test drive program lets you see a specific car in motion before visiting.
To ask about availability or book a test drive, contact the team or call (978) 429-8913. The showroom at 429 Great Rd, Acton, MA 01720 is open Monday through Friday, 9 AM to 6 PM, and Saturday, 10 AM to 4 PM.
