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On the B&B system, headers with no CATs, but with B&B pipes with CATs near the B&B muffler, the stock 1998 wiring worked.
However when I installed the stock Cayman S complete system I had to add around 18" of wiring to each side to make the secondary sensors' wiring reach the stock header CATs rear bungs. Been that way for about 2 years with no issues.
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1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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