BEIJING – The new Audi TT RS packs a 395-hp punch, can spurt from 0-62 mph (100 km/h) in just 3.7 seconds and reaches a top speed of 174 mph (280 km/h), the automaker announces Sunday during the car’s public premiere at the Beijing auto show.

Unveiled in both coupe and roadster body styles prior to its U.S. sales launch in 2017, the TT RS is the first recipient of Audi’s new turbocharged 2.5L inline 5-cyl. direct-injection gasoline engine, which adopts a transversely mounted aluminum block, among other changes.

Underscoring the added performance of the new range-topping TT models is a series of distinctive exterior styling touches, including a heavily structured front bumper with larger air ducts and more prominent splitter element than standard models. There’s also a reworked single-frame grille featuring a honeycomb insert and quattro identification.

Along the flanks are aluminum-look mirror housings and wider sills beneath the doors. The rear is distinguished by a fixed spoiler atop the trunklid, although buyers can opt for a more subtle extendable spoiler. The rear bumper gets a new lower section with an integrated diffuser and two large oval tailpipes.

In an industry first, buyers can opt for Audi’s new organic LED taillamps, each consisting of four elements, the largest of which features the TT logo and Audi’s 4-ring emblem.

The 2.5L turbo, development of which kicked off under the direction of Audi R&D boss Ulrich Hackenberg prior to his retirement in late 2015, follows the lead of the automaker’s 4-cyl. engines with an aluminum block that, combined with other changes centered on the induction system, weighs 57 lbs. (26 kg) less than the iron block unit it replaces.

At 2.5L, the TT RS’s overall swept volume is unchanged, although the adoption of Audi’s patented valve-lift system and a dual-injection system that injects fuel into both the inlet manifold and the combustion chamber is claimed to significantly improve overall efficiency.