The N54 and N55 make identical factory numbers and get there differently: two small turbochargers against one twin-scroll unit with Valvetronic. The argument between them is about what each engine accepts afterwards.
Author: Engine Specs
Engine Specs is the editorial name used for articles on this site. Our guides explain engine specifications, model trims, and ownership costs using data from manufacturers, government agencies, and established automotive publications. We do not road-test vehicles.
Is the Nissan GT-R Discontinued? The R35’s Last Years
Yes, the GT-R is discontinued. Nissan stopped building North American cars in October 2024, which makes 2024 the last US model year, and the R35 line itself closed in Japan in August 2025.
2025 Nissan Versa: Specs, Trims, and Its Final Year
The Versa is finished. Nissan now lists the sedan as no longer in production, and 2025 is its last model year in the US: a 122-hp 1.6-liter four, up to 40 mpg highway, and a starting price under $18,000.
2025 Mazda MX-5 Miata: Engine Specs, Trims, and Price
The 2025 Mazda MX-5 Miata keeps the formula that made it the best-selling two-seat roadster in history: a 181-hp 2.0-liter four-cylinder, rear-wheel drive, a curb weight under 2,520 lb, and a six-speed manual as standard. Prices start at $29,530.
2025 Subaru Crosstrek Wilderness: Specs and Towing
The 2025 Subaru Crosstrek Wilderness is not a faster Crosstrek. It keeps the 182-hp 2.5-liter flat-four, and what changes is the hardware around it: taller ride height, all-terrain tires, a shorter final drive, and a much higher tow rating.
2025 BMW X3 M: Why It’s Gone and What Replaced It
There is no 2025 BMW X3 M. The X3 moved to a new generation for 2025, and its most powerful version is the X3 M50 xDrive – a 393-hp mild-hybrid inline-six rather than the 503-hp S58 of the old X3 M Competition.
2025 Toyota GR Corolla: 300 HP and a New Automatic
The 2025 Toyota GR Corolla still makes 300 hp from its 1.6-liter turbo three-cylinder, but torque rises from 273 to 295 lb-ft and an eight-speed automatic is now offered next to the six-speed manual.
BMW X3 vs X4: Specs, Space, and Price Compared (2025)
BMW X3 or X4? For 2025 the comparison changed: the X3 moved to a new generation (G45) with new engines and a new interior, while the X4 carries on with the previous platform. That means the cheaper car is now also the newer one. Here are the specs, prices, and practical differences side by side.