Royal Enfield Himalayan DNA Air Filter Inlet Bell

thingiverse

Owners of the wonderful Royal Enfield Himalayan 411cc adventure motorcycle often fit DNA (washable) air filters to their 'bikes. One of the mounting/retaining options from DNA Filters is a plain steel plate that holds the filter in place. In terms of ‘clean’ airflow paths into the filter - whilst it's an improvement on the original equipment - I thought I'd go one step further and create an inlet bell that simply sits atop the DNA plate to create better airflow paths into the filter. Inlet pressure losses to the air filter will be significantly reduced with this addition. That being said, it probably won't make much difference in real-world performance - but as you own a Himalayan, you obviously don't have a high priority on white-knuckle-jet-fighter performance from your steed. But when one is an engineer, one is an engineer (for life), and one likes things done ‘right’.