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**biketopia** · 11-23-2021, 11:27 AM

The fact the cats are cooler at the rear is a pretty definitive test that they aren't doing a damn thing. I would check the rockers, then start looking for cats and quality o2's. Or some long tubes and a y pipe from speed engineering, new front o2's and a tune.... Even a good tune on the stock set up will net some power and MPG gains, especially with free flowing exhaust. But I know you probably don't want to do that, just a suggestion though. Does the 04 have an external fuel filter, if so have you replaced it?

11-23-2021, 11:27 AM	#16
biketopia Senior Member Join Date: Jul 2015 Location: Warrenton VA Posts: 1,008	Re: No start??? The fact the cats are cooler at the rear is a pretty definitive test that they aren't doing a damn thing. I would check the rockers, then start looking for cats and quality o2's. Or some long tubes and a y pipe from speed engineering, new front o2's and a tune.... Even a good tune on the stock set up will net some power and MPG gains, especially with free flowing exhaust. But I know you probably don't want to do that, just a suggestion though. Does the 04 have an external fuel filter, if so have you replaced it? __________________ 71 c-10 Long Bed, under the knife for a No Limit Engineering Wide Ride Chassis Pack and coil over static drop. 07 Silverado Classic 2wd 95 Camaro 427SBC/TH350