The first Caterham I ever had a go in was a well tuned crossflow, it cracked banged and spluttered, it had a fantastic induction and exaust noise. This added to the experience of the car. I was quite disappointed with the K series car I got as it did not quite have the soul of the crossflow. It did start and was 100% reliable though.
I now have the new Duratec R400 minus the cat and it is the best of both worlds
Crack bang flaming exaust, on the overrun.
Its fantastic.
I assume the mapping is not perfect and a little rich, I will not be adjusting it though!