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Downstream locatio n is between the catalytic converter and the tailpipe. 1999 Chevrolet Silverado 1500 Pickup V8 4.8L Downstream (Rear). 1999 Chevrolet Silverado 1500 Pickup V8 5.3L Downstream (Rear).
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.