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TL;DR

911 (991.2) Carrera GTSSmart Money, Pragmatists
Biggest reasons are MSRP (+34%), Torque (+16%), and Body Style (coupe / convertible).
911 (991.2) GT3Head Turners
Biggest reasons are Displacement (+34%), Compression (+33%), and Redline (+20%).
Spec Porsche 911 (991.2) Carrera GTS Porsche 911 (991.2) GT3 Difference
Model Years 2018–2019 2016–2019
Release Date 2017-08-07 2015-04-23
Body Style coupe / convertible coupe
Configuration Flat 6 Flat 6
Displacement 3.0L (182 ci) 4.0L (244 ci) +34.0%
Engine Code 9A1 9A1 GT3
Crank cross-plane cross-plane
Aspiration twin turbocharged naturally aspirated
Fuel gasoline gasoline
Redline 7,500 rpm 9,000 rpm +20.0%
Power 450 hp @ 6,500 rpm 500 hp @ 8,250 rpm +11.1%
Torque 406 ft·lbs @ 2,150 rpm 339 ft·lbs @ 6,000 rpm -16.4%
Compression 10.0:1 13.3:1 +33.0%
Bore × Stroke 91.0 × 76.4 mm 102.0 × 81.5 mm
Powertrain ICE ICE
Drivetrain RWD / AWD RWD
Transmission manual / dual clutch 7-speed manual 6-speed
Curb Weight 3,197 lbs 3,153 lbs -1.4%
Power-to-Weight 310 hp/ton 350 hp/ton +12.7%
0–100 km/h 3.6s 3.4s -5.6%
Top Speed 194 mph 198 mph +1.9%
MSRP $120,600 $161,100 +33.6%
Fuel Economy 15 / 21 / 17 mpg 15 / 21 / 17 mpg