installing LT headers with cats....is tuning required?
04-02-2004, 10:46 AM
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installing LT headers with cats....is tuning required? I'm installing a set of SLP headers (LT) with cats and emmissions to my 99 Z28 this weekend; do I have to get my PCM retuned? if not how will this affect driveability, MPG, etc?
tia.
tia.
