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Old 12-08-2008, 08:30 AM   #2
Registered User
Join Date: Feb 2005
Location: St. Louis, MO
Posts: 614
My Ride: 2000 328i
You only need 4 of the bungs. The other two are just extras. Most people use them for EGT or aftermarket wide band O2 sensors.

Pre-cat O2 sensors go at the bottom of the headers. most people install them in the first set of bungs. Make sure you keep banks 1 and 2 sorted out correctly or the car will have serious performance issues.

Post-cat O2 sensors go after your cats. With the supersprint exhaust (assuming you bought cats), you will need to extend your post-cat O2 sensor wires. If you don't have cats, you can plug them in wherever you want or leave them unplugged. Either way you will have a CEL.
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