I have a 99 half ton Chevy pickup. Not Silverado. I had a cat delete exhaust put on and I only get about 8 MPG.

Asked by Apr 11, 2017 at 09:32 PM about the 1999 Chevrolet C/K 1500 LS 4WD

Question type: Maintenance & Repair

3 Answers

27,065

HUMMMM.BELIEVE IT OR NOT YOU NEED BACK PRESSURE EVEN RACE CARS ARE USING THEM NOW...OK..YOU DID NOT SAY WHAT SIZE PIPES WERE STOCK..WHAT SIZE DID YOU PUT BACK INTO IT??/ 1 OR 2 CATS/MUFFLERS..THE NEW BRAND NAME OF THE MUFFLERS...IMPORTANT ALSO MOVING ON DID/HAS THE AIR INTAKE BEEN UPGRADED TO MATCH THE SUSPOSED EXTRA EXHAUST FLOW???? AN EXHAUST CROSS OVER??1 OR 2 TAIL PIPES/EXTENSIONS????

51,985

Has nothing to do with backpressure.......you removed the O2 sensors didn't you?

upstream O2 sensors remain downstream were tuned out in the computer

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