In virtually all configurations, the Lexus IS 350 is faster than the IS 300, thanks to its 3.5-liter V6 delivering more horsepower and torque than the 2.0-liter turbo in the IS 300. Exact 0–60 times vary by year and drivetrain, but the IS 350 generally pulls away in acceleration.
Engine and power at a glance
Key powertrain differences that drive speed are the main factors here. The following outlines the typical specs you’ll find in recent US-market models.
IS 350 specifications
The IS 350 uses a 3.5-liter V6 with roughly 311 horsepower and about 280 lb-ft of torque, depending on the exact year and trim. This setup provides stronger launch and mid-range response versus the IS 300.
- Engine: 3.5-liter V6
- Horsepower: ~311 hp
- Torque: ~268–280 lb-ft
- Drivetrain options: RWD or AWD
Power delivery tends to be smooth and linear, contributing to the IS 350’s quicker feel in everyday driving and on-ramps or straightaways.
IS 300 specifications
The IS 300 uses a 2.0-liter turbocharged inline-4 producing about 241 horsepower (with some markets/years closer to 255 hp) and roughly 258 lb-ft of torque. Availability of RWD or AWD can affect power delivery and acceleration.
- Engine: 2.0-liter turbocharged I-4
- Horsepower: ~241–255 hp
- Torque: ~258–295 lb-ft
- Drivetrain options: RWD or AWD
With the smaller turbo four, the IS 300 remains responsive but generally lacks the immediate surge of the V6, which accounts for much of the speed gap.
Performance figures: 0–60 mph and top speed
Below are typical performance figures for recent IS 300 and IS 350 configurations in the United States, noting that exact times vary by year, trim, tires, and transmission. The numbers reflect common outcomes in independent tests and official specs.
Before listing the numbers, it helps to understand that the IS 350 usually delivers quicker launches, while the IS 300’s turbo four can feel brisk but won’t match the V6’s straight-line shove in most scenarios.
- IS 350 (RWD): 0–60 mph around 5.6 seconds; top speed electronically limited to about 143 mph.
- IS 350 (AWD): 0–60 mph around 5.7–5.9 seconds; top speed about 143 mph.
- IS 300 (RWD with 2.0L turbo): 0–60 mph typically around 6.0–6.6 seconds; top speed about 143 mph.
- IS 300 (AWD with 2.0L turbo): 0–60 mph typically around 6.2–6.8 seconds; top speed about 143 mph.
Overall, the IS 350 is faster in a straight-line sprint in the vast majority of model years and configurations, with the gap widening on launches and mid-range pulls. Tire choice, transmission calibration, and weight distribution also influence the exact numbers.
Other factors to consider
Beyond raw speed, buyers weigh daily driving feel, fuel economy, and cost of ownership. The IS 350 often provides stronger highway passing power and quicker response at speed, while the IS 300 can offer better efficiency and a lower entry price in many trims. Handling, ride quality, and available performance packages (such as F Sport) can affect perceived speed and track capability as well.
Which should you choose for your use case?
If raw acceleration and left-foot freedom matter most, the IS 350 is typically the faster choice. If you prioritize efficiency, lower upfront cost, and solid daily usability, the IS 300 remains a compelling option.
Summary
The IS 350 is the faster model overall due to its larger V6 engine and higher torque output, delivering quicker 0–60 times and stronger mid-range performance across most years and trims. The IS 300, with its turbocharged four-cylinder, is more economical and nimble in some driving contexts but generally trails the IS 350 in straight-line speed. Your final decision should balance your speed needs with budget, fuel economy, and daily driving preferences.