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TL;DR

BMW Z4 (G29) M40iTourers, Builders
Biggest reasons are Power-to-Weight (+34%), Displacement (+33%), and Power (+33%).
Toyota Supra (A90) 3.0 Premium
Biggest reasons are Body Style (coupe), Configuration (Inline 4), and Transmission (automatic / manual 6-speed).
Spec BMW Z4 (G29) M40i Toyota Supra (A90) 3.0 Premium Difference
Model Years 2019–2026 2021–2026
Release Date 2018-12-21 2020-08-21
Body Style convertible coupe
Configuration Inline 6 Inline 4
Displacement 3.0L (183 ci) 2.0L (122 ci) -33.4%
Engine Code B58 B48
Crank cross-plane cross-plane
Aspiration turbocharged turbocharged
Fuel gasoline gasoline
Redline 6,500 rpm 6,500 rpm
Power 382 hp @ 5,000 rpm 255 hp @ 5,000 rpm -33.2%
Torque 369 ft·lbs @ 1,600 rpm 295 ft·lbs @ 1,550 rpm -20.0%
Compression 11.0:1 10.2:1 -7.3%
Bore × Stroke 82.0 × 94.6 mm 82.0 × 94.6 mm
Powertrain ICE ICE
Drivetrain RWD RWD
Transmission automatic 8-speed automatic / manual 6-speed
Curb Weight 3,384 lbs 3,400 lbs +0.5%
Power-to-Weight 249 hp/ton 165 hp/ton -33.5%
0–100 km/h 3.9s 3.9s
Top Speed 155 mph 155 mph
MSRP $58,900 $56,180 -4.6%
Fuel Economy 23 / 29 / 25 mpg 25 / 31 / 27 mpg +8.0%