Does a plugged cat affect your fuel mileage?

 

if your cats plug, mileage will be the least of your worries...if your still driving the truck, its not plugged...it might be on its way out, and yes, it will affect mileage

 

just gut the cat and make an 02 sim

 

take it off, gut it, put it back on, and GO
yeee doggy theres a scorpion in my boot.

 

Mine rattled for a while before I localed this site. One day I was driving downthe highway and boom, truck stalled and would hardly idle.

Was the cat, don't let this happen to you.

 

ok how do I gut the cat and do the o2 sim?

 

First order you a fastman simm at www.thefastman.com ............, connect the four wires off the old O2 senor to the simm, I used wire nutz & black tape, mount the simm on your frame rail, then take a saw or even better an electricsaw cut 2" to 3" behind the cat, cut off and remove the old system, take a long metal rod [2 foot] and B.F. hammer and start to punch it after doing this serval times, take a shop vac and suck, reving the motor also works well, and get your new muffler hook it to the 2"-3" pipe, hang it then go yo the muffler shop
Aslong as you do the gutting [NOT the shop] he well problay do the install

 

First off do you live in a State that requires smog inspections. If you do and you gut your cat you will eventually have a problem.

Now to your original question, yes a plugged cat will affect your fuel mileage. If the cat is totally plugged it will also cause the engine to stall. A partially plugged cat will cause loss of power as well as poor mileage.

These links might help you.
http://www.aa1car.com/library/converter.htm
http://auto.howstuffworks.com/question482.htm

 

I live in Kansas and just recently installed new flowmaster muffler in november. I talked to the guy who put on my flowmaster and he wants 233 dollars for a new magna flow cat.

 

if i just boughtth o2 simulator, could i then just completely get rid of the cat and straight pipe it or will I lose to much on the low end?