Audi is working on its 5-cylinder, 2.5-liter gasoline engine to catch up with AMG's 4-cylinder, 2.0-liter turbo.

Audi is working on an upgrade for its 5-cylinder, 2.5-liter gasoline engine to catch up with AMG's 4-cylinder, 2.0-liter turbo in the upcoming Mercedes-Benz A45 AMG.

Audi's quattro division is impressed by AMG's engine and they plan on tweaking the combustion process of the five-cylinder unit as an attempt to squeeze additional horsepower and torque, while at the same time slashing emissions.

While the AMG 4-cylinder turbo engine produces 350 hp (261 kW), the most powerful version of the 5-cylinder, 2.5-liter TFSI offered by Audi develops only an additional 10 hp (7.4 kW) compared to the German four-pot.

Audi also has another thing to worry. In September 2014 the EU6 emissions regulations will be introduced in Europe. In an interview given by quattro development boss Stephan Reil to Motoring.com.au, he said "the five-cylinder engine has to be EU6-compliant and we have to modify it" by making changes to the catalysts and geometry.

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Audi to upgrade its 5-cylinder engine to catch up with AMG - report