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TL;DR

BMW M3 (G80) CompetitionSmart Money, Pragmatists
Biggest reasons are MSRP (+106%), Torque (+29%), and Body Style (sedan).
Porsche 911 (991.2) GT3Minimalists
Biggest reasons are Compression (+43%), Displacement (+34%), and Redline (+25%).
Spec BMW M3 (G80) Competition Porsche 911 (991.2) GT3 Difference
Model Years 2021–2026 2016–2019
Release Date 2020-11-01 2015-04-23
Body Style sedan coupe
Configuration Inline 6 Flat 6
Displacement 3.0L (183 ci) 4.0L (244 ci) +33.5%
Engine Code S58B30 9A1 GT3
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 500 hp @ 8,250 rpm -0.6%
Torque 479 ft·lbs @ 2,750 rpm 339 ft·lbs @ 6,000 rpm -29.2%
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 3,153 lbs -19.4%
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 $161,100 +106.3%
Fuel Economy 16 / 23 / 18 mpg 15 / 21 / 17 mpg -5.6%