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TL;DR

911 (991.2) GT3 RS
Biggest reasons are Compression (+26%), Redline (+20%), and Body Style (coupe).
911 (991.2) TurboSmart Money, Pragmatists
Biggest reasons are Torque (+51%), MSRP (+15%), and Body Style (coupe / convertible).
Spec Porsche 911 (991.2) GT3 RS Porsche 911 (991.2) Turbo Difference
Model Years 2019 2016–2019
Release Date 2018-07-06 2015-04-23
Body Style coupe coupe / convertible
Configuration Flat 6 Flat 6
Displacement 4.0L (244 ci) 3.8L (232 ci) -4.9%
Engine Code 9A1 GT3 9A1 Turbo
Crank cross-plane cross-plane
Aspiration naturally aspirated twin turbocharged
Fuel gasoline gasoline
Redline 9,000 rpm 7,200 rpm -20.0%
Power 520 hp @ 8,250 rpm 540 hp @ 6,400 rpm +3.8%
Torque 347 ft·lbs @ 6,000 rpm 524 ft·lbs @ 1,950 rpm +51.1%
Compression 13.3:1 9.8:1 -26.3%
Bore × Stroke 102.0 × 81.5 mm 102.0 × 77.5 mm
Powertrain ICE ICE
Drivetrain RWD AWD
Transmission dual clutch 7-speed dual clutch 7-speed
Curb Weight 3,153 lbs 3,516 lbs +11.5%
Power-to-Weight 364 hp/ton 339 hp/ton -6.9%
0–100 km/h 3.2s 3.0s -6.3%
Top Speed 194 mph 199 mph +2.6%
MSRP $187,500 $159,200 -15.1%
Fuel Economy 15 / 21 / 17 mpg 15 / 21 / 17 mpg