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TL;DR

911 (992.1) GT3 RS
Biggest reasons are Transmission (dual clutch 7-speed), Downforce (903 lbs @ 177 mph), and Fuel Economy (14 / 18 / 16 mpg).
911 (992.2) GT3Collectors
Biggest reasons are MSRP (+18%), Transmission (manual 6-speed), and Downforce (—).
Spec Porsche 911 (992.1) GT3 RS Porsche 911 (992.2) GT3 Difference
Model Years 2020–2024 2025–2027
Release Date 2019-12-27 2024-09-18
Body Style coupe coupe
Configuration Flat 6 Flat 6
Displacement 4.0L (244 ci) 4.0L (244 ci)
Engine Code MA2.75 MA2.75
Crank cross-plane cross-plane
Aspiration naturally aspirated naturally aspirated
Fuel gasoline gasoline
Redline 9,000 rpm 9,000 rpm
Power 518 hp @ 8,500 rpm 502 hp @ 8,400 rpm -3.1%
Torque 343 ft·lbs @ 6,300 rpm 347 ft·lbs @ 6,100 rpm +1.1%
Compression 13.3:1 13.3:1
Bore × Stroke 102.0 × 81.5 mm 102.0 × 81.5 mm
Powertrain ICE ICE
Drivetrain RWD RWD
Transmission dual clutch 7-speed manual 6-speed
Curb Weight 3,197 lbs 3,164 lbs -1.0%
Power-to-Weight 357 hp/ton 350 hp/ton -2.1%
Downforce 903 lbs @ 177 mph
0–100 km/h 3.2s 3.4s +6.2%
Top Speed 184 mph 198 mph +7.4%
MSRP $223,800 $182,900 -18.3%
Fuel Economy 14 / 18 / 16 mpg