Fear not. Help is at hand. KTM has announced an upgrade to its skeletal carbon-fibre car, boosting power of the 2.0-litre Audi-sourced turbo engine by a full 60bhp to a nice round 300bhp. Torque is up from 228lb ft to 295lb ft.
All of which means a power-to-weight ratio of 380bhp per tonne, and a 0-60mph time of 3.5 seconds.
We've already had a good drive in the uprated X-Bow (check out the September issue of Top Gear magazine, out on August 12), and we can report it's all good: far more muscular and torquey than the 240bhp - which, let's be honest, was hardly slow.
In short, it's now a hugely, hugely fast thing, with the sort of acceleration that threatens to drag your face right the way up over the top of your head, never to return.
KTM will retro-fit the upgrade to any existing X-Bow for just over £5,000. If you've got a X-Bow, you don't really have a choice, do you?