The airbox was designed to the correct volume for resonant tuning, gives meaningful bump to power in the tuned RPM band. Use one along with a proper air filter and cold air trunking, K&N's for DCOE look cool and add bark to the induction noise but, as Bill says, draw hot engine bay air plus are not well regarded in terms of filtration. Carb related fires have been a major peril for cars fitted with the 900 series lotus engine, with total loss of the vehicle a real possibility. Electronic triggered distributor does not eliminate the hazard as there are still arcs on the high tension side from rotor to plug wire posts. Conversion to crank-fired, distributor-less layout resolves a number of issues and will help reduce the fire risk.? Effective measures that mitigate much of the Webers' leaking, not to mention performance shortcomings, are to be had over on the Sidedraft forum hosted at the attached link. Highly recommended.
https://vintagetechnologygarage.groups.io/g/sidedraft/topics
Cheers
Steve
