Mods/Repairs to do while doing Plenum repair
Record Breaker
Joined: Aug 2010
Posts: 2,241
Likes: 12
From: Ohio
Up-stream o2 sensor. Just put a new one on mine...so far theres a fairly big difference. Runs much better.
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Legend
Joined: Mar 2011
Posts: 8,914
Likes: 4
From: Fredericksburg, Virginia
If your doing the plenum and you haven't already your gonna need to either replace or gut (depends on the emission's law's in your state) your catalytic converter and replace the pre-cat O2 sensor, don't get Bosch.
Champion
Joined: Feb 2009
Posts: 3,416
Likes: 4
From: Bay Area, CA
Not always true. Depending on how bad the plenums blown and for how long, you won't need to replace the cat.
