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Old 02-18-2013, 01:24 AM   #24 (permalink)
Jordo!
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Absolutely necessary?

If the ECU has to run excessively high fuel trims to maintain target AFR's (resulting in a CEL), there is knock under load, or driveability is poor.

What mods could cause this condition? Any major change to the intake or exhaust plumbing orientation, diameter, or flow.

Individual results may vary...
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