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Installing LT's AFTER a tune: retune a must?

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Old 10-10-2019, 07:58 AM
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Default Installing LT's AFTER a tune: retune a must?
Going to install a set of LTs in my cammed 4.8 RCSB while it is down getting regeared (4.56's)

It had cats and manifolds when tuned the first time- is a retune a must after going to LT's and catless ORY?
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Old 10-10-2019, 08:11 AM
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At a min you'd need the rear O2's codes shut off. You'd benefit from some tweaks from the LT's, but otherwise its not absolutely mandatory.
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Old 10-10-2019, 11:00 AM
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Like DDN said its not mandatory just helps to make it run optimally and get rid of the SES light. I drove mine untuned for months after the install no problems at all.
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