K&N X-Stream Top Assembly 14in OD 5.125in Neck Flange 3.063in H
$199.99
KNN66-3040
Air Boxes
Air Filters
Air Filters - Universal Fit
Air Intake Systems
BMW Z4
Not only does the K&N XStream add filter area, it actually redirects airflow inside the filter to pull in more air through the side...
K&N X-Stream Top Assembly 14in OD 5.125in Neck Flange 4.62in H w/Vent
$199.99
KNN66-3010
Air Boxes
Air Filters
Air Filters - Universal Fit
Air Intake Systems
BMW Z4
Not only does the K&N XStream add filter area, it actually redirects airflow inside the filter to pull in more air through the side...
K&N X-Stream Top Assembly 5.125in Flange ID / 14inx3.75in H / 1.25in Drop B
$199.99
KNN66-3060
Air Boxes
Air Filters
Air Filters - Universal Fit
Air Intake Systems
BMW Z4
Not only does the K&N XStream add filter area, it actually redirects airflow inside the filter to pull in more air through the side...
K&N X-Stream Top Filter Only 11in - Black
$99.99
KNN66-1101
Air Filters
Air Filters - Universal Fit
BMW Z4
Performance
K&N XStream Air Flow Tops replace the top of your existing round filter and add a new dimension to engine breathing by feeding your...
K&N X-Stream Top Filter Red 11in / 5.125in Neck Flange / 3.5in Height
$199.99
KNN66-3110
Air Boxes
Air Filters
Air Filters - Universal Fit
Air Intake Systems
BMW Z4
Performance
Not only does the K&N XStream add filter area, it actually redirects airflow inside the filter to pull in more air through the side...
K&N X-Stream Top Filter X-Stream 14 inch OD Black
$89.99
KNN66-1401
Air Filters
Air Filters - Universal Fit
BMW Z4
Performance
K&N XStream Air Flow Tops replace the top of your existing round filter and add a new dimension to engine breathing by feeding your...
K&N X-Stream Top Filter X-Stream 14 inch OD Chrome
$139.99
KNN66-1401XP
Air Filters
Air Filters - Universal Fit
BMW Z4
Performance
K&N XStream Air Flow Tops replace the top of your existing round filter and add a new dimension to engine breathing by feeding your...
