If the standard McLaren P1 hypercar wasn't potent enough, with its combined 903bhp output from its 3.8-litre twin-turbocharged V8 hybrid powertrain, the P1 GTR produces 986bhp from the same-sized hybrid unit.
The P1 GTR also tips the scales at 50kg less than its road-going sibling - at 1440kg - and features a more extensive aerodynamic package which produces 10% more downforce than the P1 road car at 150mph.
Read our in-depth review of the hardcore track-only hypercar here.
3 - 2015 Ford Ecosport 1.0 Ecoboost
Ford's updated Ecosport baby crossover features on our list for the second week running.
We tested the outgoing Ecosport version last year, and while we were impressed with its cabin space and manual gearshift quality, we found it possessed rudimentary chassis dynamics, a gruff diesel engine and a poor quality cabin poor.
However, the Blue Oval has given this refreshed Ecosport a thorough update to address the previous version's shortcomings. Click here to read our verdict.
4 - Radical RXC500
Focused track cars are a hot topic on autocar.co.uk and Radical's latest creation continues this trend.
When we drove the outgoing Radical RXC last year, we found it to be a sensational track car with a chassis that could handle more power than its 350bhp 3.7-litre Ford V6 offered.
However, this new Radical RXC500 now develops 530bhp from its 3.5-litre twin-turbocharged V6 and can sprint from 0-60mph in a claimed 2.6sec.
Read our review here.
5 - BMW M135i
When the BMW M135i went on sale more than two years ago it rewrote the hot hatchback rule book, given the spectacular performance on offer and its comparitive bang-for-buck value.
The BMW M135i has remained one of the most revered hot hatchbacks with our readers since. This 2015 facelifted version gains more power, cosmetic styling tweaks and new technology.
Click here to read our verdict of the rapid hot hatchback.
Read more Autocar reviews here.