1. standard out diameter 76mm, 89mm, 101mm, and 11
... More4mm. 2. standard intake diameter 54mm, 57mm, 60mm, 63mm, 66mm, 70mm, 73mm, 77mm, 81mm. 3. other sizes customize service available. 4. inclined end and plain end available. 5. oem service available..syi Less