What model yr do you have? The exhaust diagram you show is for the 2005+ 987 boxsters. The pre-2005 986 models have a different set up.
Also, banks 1-3 are on the passenger side if I'm not mistaken, so I'm not sure why you're getting an 1128 if your leak is on the driver's side. I'm no expert though.
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Current: 07 Carrera S Cab in Midnight Blue
Previous: 01 Boxster in Arctic Silver, 86 944 in Guards Red
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