For durability, Noble also added forged pistons, an oil cooler, a larger baffled oil sump, and extra cooling ducts. Its engine has a maximum power of 425 hp (431 PS; 317 kW) at 6,500 rpm, with a torque figure of 390 lb⋅ft (529 N⋅m) at 5,000 rpm.[6] This power and a weight of 1,134 kg (2,500 lb) allow the M400 to achieve a power-to-weight ratio of just over 400 hp (406 PS; 298 kW)/ton (the figure for which it was named) a 0–60 mph (97 km/h) acceleration time of 3.2 seconds and a 1⁄4 mile (402 m) time of 11.4 at 119.8 mph (192.8 km/h).[7][3] The M400 can achieve a top speed of 187 mph (301 km/h). The UK automotive TV show Vroom Vroom suggested that the M400 gave Ferrari Enzo performance at a Porsche 911 price.
The most notable differences from the M12 (a car which the M400 is largely based on) are the use of forged pistons, T28 turbos, a front anti-roll bar, stiffer springs, different shocks, Pirelli P Zero tyres, a smoother gear shifter, and a slightly narrower central tunnel as the driver now sits a bit more central than previous models. Exterior differences remain subtle. The colour scheme tends to incorporate anthracite (Gris) wheels, rear wing supports and wing ends but some examples maintain silver wheels and supports. The front splitter is now removed (Although many owners opt to have this put on). The main change is the addition of side pods to channel air into the engine and to create a visual impact. Air conditioning was an £1,995 option and adds to the weight. The interior has an added oil gauge that resides next to the boost gauge. Additionally, the Sparco Alcantara seats and trimmings differ from the other Nobles' (Alcantara is one third the weight of leather). The Noble M400 was awarded the car of the year award in 2005 by one publication[who?]. With just 75 examples made, this version is sought after and rare.
Although, the M400 is no longer in production, the exclusive dealer for Noble in the US, 1G Racing in Ohio, USA (also known as Rossion), had obtained the production rights to the M400 from Noble Automotive, and has released an updated version named Rossion Q1. The Rossion Q1 uses an updated M400 platform, 1G's version of the M400 includes a redesigned aerodynamic shell, a new interior and an upgraded engine management system, upgrading the power output to 450 hp (336 kW).[8] 0-60 mph (97 km/h) has dropped from 3.3 seconds to 3.1.[9] Its top speed changed to 189 mph (304 km/h).
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