The Italian manufacturer has added its 1750 TBi petrol and 2.0 JTDm diesel engines to the Brera coupe and Spider convertible models months after introducing the engines to the Alfa 159 last year.
The 1750 TBi petrol engine delivers 200bhp and 320Nm of torque. With the new engine, the Alfa Brera and Alfa Spider achieve 0-62mph in 7.7 and 7.8 seconds respectively.
Both models have a top speed of 143mph but Alfa has also lowered CO2 emissions to 189g/km for the Brera and 192g/km for the Spider.
Alfa says the engine is more refined to offer more consistent delivery of power when overtaking or cruising over long distances.
The diesel model is an evolution of the first common rail diesel technology used ten years ago in the Alfa 156.
The 2.0-litre JTDm 170bhp unit reduces CO2 emissions to 142g/km but increases power and torque in both models. The Alfa Brera and Spider cover 0-62mph in 8.8 and 9 seconds respectively, and the top speed is slightly lower than the petrol versions at 135mph.
Alfa’s new special edition Italia Independent trim has been introduced to both models. IT includes matt black titanium finish, 18" black alloy wheels, red brake callipers and an aluminium fuel cap inspired by the Alfa 8C.
The new trim level features a black leather steering wheel and gear knob, sports dials and leather upholstery, aluminium sports pedals, a radio/sat-nav system and Italia Independent badging on the headrests.
The sporty Alfa Brera coupe and Spider convertible have recently been joined by the Alfa Giulietta, Mito city car and forthcoming Giulia in the new-look Alfa line-up for 2010.