German tuner Wimmer RS has prepared a tuning program for the Ariel Atom 3 which dials its initial 300 HP output to 340 HP.
The power increase on the Wimmer Ariel Atom 3 was enabled through revised engine electronics, and other upgrades that have been performed include a compressor overhaul, a fuel pump conversion and a sport exhaust system.
With 340 HP and 282 Nm of torque packed under its tube frame body, the Wimmer Ariel Atom 3 which weights only 469 Kg is now able to rocket from nought to 100 Km/h in 2.8 seconds, while the 200 Km/h mark also leaving from a stand still was achieved in 7.1 seconds.
Pricing details regarding the Wimmer Ariel Atom 3 conversion are available upon request. 
Wimmer RS press release :
Extra power – high performance sports car Ariel Atom 3 300 by Wimmer RS
Wimmer RS has tuned the Atom 3 300 up to 340 hp
The Ariel Atom is one of the fastest street cars, maybe the strongest sprint 4-cylinder series car in the world. The standard Atom 3 300 is driven by a turbocharged up to 300 hp two-liter four-cylinder Honda engine. With a weight of only 469 kg, it can easily keep up not only with super sports cars – after the power increase at Wimmer RS it can put some of them in the shade.
A vehicle like a rocket: only 469 kg weight, no doors, no luxury.
The Atom is equipped with the unique internal shock absorbers. The suspension is operated via push-rods – the damper struts are at the top.
The tube frame replaces the body. This provides rigidity, low weight and maximum safety for corner speeds.
The power increase at Wimmer RS includes the following reconstruction measures: Wimmer engine optimization software, compressor overhaul, fuel pump conversion and sport exhaust system together with Rennkat. Whopping 340 hp and 282 Nm are the result. With such powerful Japanese engine in the rear, this 469-kg rocket accelerates from zero to 100 km/h in 2.8 seconds – Atom achieved 200 km/h in just 7.1 seconds
Direct air suction sounds like a hissing, and by this modification, exhaust system with optimized back pressure from Wimmer RS allows to hide the entire power behind the seat, so you will hear a wonderful sound.
 

Source: Wimmer RS