Under the bonnet of the C-segment hatchback Novitec is offering custom-tailored versions of its self-styled "Powerjet 2" tuning modules for both the turbocharged petrol and diesel engines models. Its plug-in application for the auxiliary control module on the 1.4 TB 16V version produces a claimed 141 hp (104 kW) of power, 21 hp up from standard 120 hp (88 kW). Power output of the Novitec-tuned MultiAir engine with identical displacement meanwhile jumps from the standard 170 hp (125 kW) to a more powerful, claimed, 195 hp (141 kW).

Novitec's engine tuning extends to the 1.8-litre turbocharged engine and here the Powerjet 2 module claims to bump power output of the four-valve, four-cylinder engine up by 26 hp (19 kW) and boost peak torque to 386 Nm (from the standard car's 340 Nm). Novitec thus claims that adds up to a new power output of 261 hp (192 kW) and a 0 to 100 km/h time of 6.5 seconds (the production model does this in 6.8 seconds) on the way to a claimed new top speed of 251 km/h (production model top speed is 242 km/h). The Novitec tuning programme for the 1.8 TB engine costs 419 euros excluding taxes.

Engine tuning is also available for the three turbodiesel engines in the Giulietta range. The German tuner's "Powerrail 5" module, which is also installed by means of a plug connector, lends the 1.6 JTD 16V model a claimed extra 15 hp (11 kW) of power. For the 2.0 JTD 16V model with a standard power output of 140 hp (103 kW) the auxiliary control unit claims to add an extra 20 hp (14.7 kW). Extra power output is available for the 170 hp diesel model with custom-calibrated auxiliary control unit improving rating to a claimed 195 hp (143 kW) while peak torque grows by 50 Nm to 400 Nm. All the Powerrail 5 modules cost 335 euros excluding taxes. Novitec is also offering a number of stainless steel exhaust back boxes in various designs of two or four exit configurations which aim to create a sportier exhaust note.

Novitec is offering new wheel/tyre combinations for the Giulietta in 18-, 19-, and 20-inch formats. The biggest, dubbed the Novitec N10 and available in either a silver or matte-black finish, come in size 8.5Jx20 and are shod with 235/50 R 20 Pirelli P Zero tyres. Sports springs lower the car by 35 mm while the stainless-steel coil-over suspension comes with adjustable ride height and damper rates. It lends the Alfa Romeo a firmer setup than standard and provides infinitely variable ride-height lowering between 35 and 75 millimeters.

A new body kit claims to offer aerodynamic enhancements. New front lip spoiler sections fit on either side of the car and cost 167 euros while the centrally-mounted spoiler section is 83 euros. This combination, Novitec claims, reduces lift on the front axle. New side skirts (234 euros) and a new rear fascia (167 euros) come in several different versions with specific cutouts for the various exhaust exit options.

Novitec components come with general operating certificates, thus saving customers, particularly on the German market, with possibly costly and time-intensive individual technical inspections. They also eliminate the need to register the body components in the vehicle registration documents.