Review on Marsflex Downstream Upstream Compatible Silverado by Onsommoshit Mathews
not the best option
it didn't work for my truck, didn't match the old ones I pulled out and the truck didn't work properly, it worked better with them than the old ones but my gas mileage was still low and it had trouble starting when the engine was warm and yes I tested the 2001 Silveroda 1500 5.3L first to make sure it would fit my truck. These are the best options. I would recommend a different product
- Automotive
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