Trust me i know about dealing with fuel injectors, i program my own pcm in my truck. The ark resonated high flow cat test pipe was designed to get the most out of the motor, while keeping the sound and smell down from removing an oem catalytic converter.
Primary, chevrolet, gmc, truck, 4.8l/5.3l/6.0l, pair.
High flow cats for 5.3 vortec. Iii, 5.3l iron block truck engines you can pick up in wrecking yards for about $600. High flow direct fit catalytic converter by ark performance®. If the front o2 sensors fail the tune goes to crap, usually rich, but if the rear sensors fail all it really means is a dash light.
Jba leads the industry in 50 state emissions legal exhaust. What some people did, was take the o2 sensor out of the direct path of the exhaust, which means, welding on a spacer, to put the sensor away from the direct flow of the exhaust. The largest valves that most recommend for a sub 4 bore would be 2.00/1.55.
If you're going to change your cats, just get them cut off. I have a line on an obx long tube system with high flow cats for cheap. You will def get hp gains out of it.quite a few actually but with headers,hiflow cats and the rest of the exhaust with labor youre looking at prob close to 2500 round about.it will sound awesome.
There were a couple key areas where the lm7 excelled: Here is a before and after of my 5.3 with the high flow cats, i know this is a late post but i struggled to find out what it would sound like before i did this mod, but i pulled the trigger anyways. Either way your engine light will come on eventually.
Fully dressed, it’s a bit lighter than gen. Vortex exhaust technology delivers enhanced engine efficiency and performance, resulting in significant power gains, improved mpg and dramatically reduced emissions. Although i only have the 5.3 i want the same setup youre talking about.not too many people on here that i have seen even go with true duals.
Jba is a leader in stainless steel headers and performance exhaust products for cars & trucks. Finally, bear in mind that high flow catalytic converters often boost fuel economy on performance vehicles. I had a set of jba headers on my old tbi 4.3 paid $350 which is way too dame high.
High flow cats increase power the problem with regular catalytic converters is that they don’t always allow the gasses to pass through as efficiently as possible. Basicall cot setting is a temperature setting at which the computer dumps extra fuel to cool off your cats, because when cats get to hot they dont do their job. Personally, i would not go with the prc 2.5 heads if using 243/799 heads, the larger valves with the smaller 5.3 bore can cause valve shrouding, especially with larger duration/lift cams.
I have never used these headers buti found a set of 4.3l vortec fully polished stainless steel headers and you would think $500+ nope how is $180 shipped. Converter has a substrate made up of 700 cells per square inch, so the exhaust flow with an aftermarket converter is a little freer, but not dramatically! If your truck has this feature and you cut off your cats, it will read that the cats are too hot and dump more fuel into the mix to cool them making you run ruch and decrease mileage and performance.
Leading the way in exhaust technology. In theory, an aftermarket cat is higher flow than it's o.e. High flow catalytic converters allow for the more efficient flow of exhaust gasses, removing restrictions that can impede performance.
Mine comes on when it wants and goes off. It makes sense for engine swaps. We would like to show you a description here but the site won’t allow us.
The front o2 sensors is what does the bulk of the tuning. My only issue before i pull the trigger is that i want to make sure that my truck will be street legal (or semi legal) i really don't want to have to put up with the hassle of failing an inspection or switching the exhaust every time i get it inspected. The main job of the o2 sensor is to make sure the cats are in place, and play a smaller role in fine tuning the fuel/air mix.
Vortec 5.3 6.0 truck headers exhaust manifolds. $75 (phx > ahwatukee) pic hide this posting restore restore this posting.