This is an adapter to attach the original airbox boots to 54mm pods. The intention of the design is to leverage the smooth airflow characteristics of the original airbox boots to ensure that no part of the carb throat is blocked for improved throttle response.

You will need to trim the airbox boots to use for this design or purchase a new set from eBay. I printed in PETG and do not expect any issues with heat in this application. This should work with any of the DOHC motorcycles from the early 80s that uses 54mm pods. Cylinder 1 & 4 boots have a weird angle, but I'm using them with no issues.

You will also need to rejet for pods. Mine works really well with these jets purchased separately (ie not in a kit):

slow jet: 38
primary: 80
secondary: 120

Requires supports, Brim is optional.
I am not using a clamp on the union because it's very secure but you can use a clamp if you choose to have that extra bit of sealing.

These resolved a slide flutter I was experiencing opening the throttle at low RPM (hard acceleration). Without the adapters, the flutter would result in a hesitation before accelerating but the flutter is 98% eradicated. I can hear it slightly but no longer feel it affecting acceleration.

This design also greatly reduces surging when riding in a crosswind.

random videos of my bike running with these pod adaptors
https://youtu.be/E7vDtSlW7no?si=3ubuwGMiyPsCMch-

Doesn't Matter

Yes

30 or higher

cut the boot close to where it normally attaches to the airbox. The adapter attaches the same way as the airbox. The boots will be a tight fit and you will need to work them into the groove and coax it from the other side to get it to sit correctly. It's better to leave a little extra material on the boot than to cut it too short like I did in the picture.

I turned off cooling for better layer adhesion. There is enough room to shrink the height just a little so the installed depth is not as long but everything fits fine without any reductions.