154,000 97 Expy
My 97 Expy XLT 5.4 4X4 is running very strong at 154,000+. All stock engine except a K&N drop-in filter. Pulls a 16' SAR trailer with no issues.
Considering a cat-back flowmaster - anyone know if a cat-back muffler makes you need a tuning change (chip, etc.)?
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