Exhaust system

Asked by GuruH4FV1 Jun 28, 2019 at 02:29 PM about the Chevrolet Silverado 1500HD

Question type: Maintenance & Repair

94 Chevy Silverado 1500, recently dumped the muffler , ran straight pipe to
back, a day or to latter ruff vibrate when stoping or idling , run smooth while
driving, thinking about omitting cat short pipe out the side ?

1 Answer

348,355

Don't eliminate the cat or the O2 sensors! The engine cannot determine the correct fuel air ratio without them.

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