These are modified, genuine GM, “Cathedral Port” seals to fit the machined insets on the Magnuson supercharger inlet ports.
Sold only as a pair.
Diagnosis - Repair - Refresh
While supplies last!
$124.00
This is a set (pair) of seals for all Cathedral Port intakes on LS family engines.
In stock
These are modified, genuine GM, “Cathedral Port” seals to fit the machined insets on the Magnuson supercharger inlet ports.
Sold only as a pair.
Full instructions are always included with Simple Engineering’s parts and accessories. Click on the link below to view them here, download them or print them out.

All of our parts and accessories are thoroughly tested for compatibility and carry a satisfaction guarantee. If you have any questions or concerns, please don't hesitate to contact us directly.
Driveline
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Driveline