My truck is deleted, but I left the cat on to keep it quiet and also for visual inspections, I put a muffler in place of the DPF so it isn’t readily noticeable that it’s been removed. After about 130,000 mile of being deleted my fuel mileage is starting to go down. My mechanic says my cat is probably full of soot since the DEF isn’t being injected to keep the cat clean. I’ve got another cat that’s been cut in front (missing V-band), that I’m going to hollow out and swap out, but after looking under the truck the cat is sandwiched between the trans crossmember and the torsion bar connection/end piece.
How difficult is it to pull the trans crossmember and what do you use to support the trans? Can this be done without a lift?
Sent from my iPhone using Tapatalk
Not having the DEF clogging up the cat is a good thing, having only soot is easier to burn off.
You show Motor Ops for tuning do you have the AutoCal where you can do a data log and email them the results.
What’s your balance rates show ?
Are you using any diesel additives, the fuel quality is going downhill?
Are you using bio fuel to high of a % will affect mileage.
What kinda fuel mileage drop are you experiencing?
Weather changes affects mileage.
Drive the front on blocks, 6” would work.
Unbolt the crossmember and slide it out of the way.
Floor jack to support the trans.
Having personal experiences with cat and without cat, without, it’ll be a little louder and mucho diesel exhaust stink that even a aftermarket cat can not handle.
I put mine back on after 5 years of suffering with the stink.