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TL;DR

BMW M3 (G80) CompetitionSmart Money, Pragmatists
Biggest reasons are MSRP (+134%), Torque (+28%), and Body Style (sedan).
Porsche 911 (992.1) GT3Minimalists
Biggest reasons are Compression (+43%), Displacement (+34%), and Redline (+25%).
Spec BMW M3 (G80) Competition Porsche 911 (992.1) GT3 Difference
Model Years 2021–2026 2020–2024
Release Date 2020-11-01 2019-12-27
Body Style sedan coupe
Configuration Inline 6 Flat 6
Displacement 3.0L (183 ci) 4.0L (244 ci) +33.5%
Engine Code S58B30 MA2.75
Crank cross-plane cross-plane
Aspiration twin turbocharged naturally aspirated
Fuel gasoline gasoline
Redline 7,200 rpm 9,000 rpm +25.0%
Power 503 hp @ 6,250 rpm 502 hp @ 8,400 rpm -0.2%
Torque 479 ft·lbs @ 2,750 rpm 347 ft·lbs @ 6,100 rpm -27.7%
Compression 9.3:1 13.3:1 +43.0%
Bore × Stroke 84.0 × 90.0 mm 102.0 × 81.5 mm
Powertrain ICE ICE
Drivetrain AWD RWD
Transmission automatic 8-speed manual 6-speed
Curb Weight 3,913 lbs 3,164 lbs -19.2%
Power-to-Weight 283 hp/ton 350 hp/ton +23.4%
0–100 km/h 3.5s 3.4s -2.9%
Top Speed 180 mph 198 mph +9.7%
MSRP $78,095 $182,900 +134.2%
Fuel Economy 16 / 23 / 18 mpg 14 / 18 / 16 mpg -11.1%