Can I use HFS-2 instead of HFS-3 for my 335i setup ?

[Richard L]

Both Jeff and I believe in explaining how the system works first. At the same time acquiring information from the end user so that we can offer the most appropriate system for the application. It works well most of the time especially the user can supply good information.

The difference between H2 and H3 is the failsafe. If you are on the modification path, failsafe offers greater safe tuning potential

When you are calulating the total flow, allow 15-20% extra. It is not a good idea to put a ceiling on the flow because you can always reduce the flow electronically.

For the 335i, two 1mm jet is a norm. If you are running 0.4mm + 0.7mm, use the middle restrictor.