The DEX408 has the lowest bodyshell around – this has many benefits, like low centre of gravity, minimal frontal area to punch through the air (perhaps giving more run time or speed?) more air flow over the rear wing etc (so that too can be lower), but it also helps with heat management. The engine head in a DNX408 gets the most direct clean airflow of any car, plus the body is designed to direct as much air as possible over the bodyshell at the engine head, rather than through the body. The central engine and low bodyshell mean that all shock bodies are also in clean airflow.  The DNX408s body is long and slim at the rear which encloses the exhaust header and insulates the left rear shock, while it is trimmed to help direct/suck hot air away from either rear shock.