Audi is allegedly working on an S3 Plus model to fill the gap between the S3 and the upcoming range-topping RS3.

The Audi S3 is currently the top dog in the A3 lineup with a 4-cylinder, 2.0-liter TFSI engine delivering 296 bhp (220 kW) and 280 lb-ft (380 Nm). Pretty soon it will be dethroned by the RS3 which will have an evolution of the 5-cylinder 2.5-liter Euro 6-compliant engine. It seems between these two models there will be an S3 Plus powered by an upgraded EA888 engine.

With this unit Audi wants to create the most powerful 4-cylinder, 2.0-liter engine in the world so it will allegedly have more oomph than Mercedes-Benz's unit which powers the AMG versions of the A-Class lineup. The AMG motor delivers 355 bhp (265 kW) and 450 Nm (332 lb-ft) while Audi's unit is said to output somewhere in the region of 375 bhp (280 kW) and almost 500 Nm (369 lb-ft).

The same report mentions Audi plans on introducing the S3 Plus in 2015 but the model could be revealed before the end of this year. Expect the same engine to power hotter versions (RS most likely) of the third-gen Audi TT (both coupe and convertible).

Taking into account the S3 Plus is rumored to have 375 bhp we can imagine the RS3 will go well beyond the 400 bhp (298 kW) mark to justify the added price tag and the flagship position. The RS3 will reportedly be unveiled this spring so look for a Geneva Motor Show launch this March.

Gallery: Audi S3 Plus with 375 bhp planned to slot between S3 and RS3 - report

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