i "True dualled" my truck with 2.25 pipe and no cats. I regret it now. I put two new bosch o2 sensors in it. After a little bit i threw a CEL so i put an o2 extender on it. That took care of it for a while but now it back on. IM tired of having no torque with this setup. Since its throwing a code i am either putting cats on it........or could i get away with some mufflers that dont flow like crazy. I am wondering if since their is so much flow the motor tries to tune to compansate for it which throws a ****load more gasdown the pipes and throws the code. My question is i would rather put mufflers on it and try to get torque back than put cats, but i dont know if that would effect the code in anyway.

 

What year is your truck, and Cali, or Fed emissions?

 

Some one else will chime in on the particulars of the exhaust, but basically it is opened up too much. As far as the 02's go, Bosch are junk. OEM, NTK or at least Standard Motor Products are way better.

Not to mention problems with the plenum(do a search here if your not familiar), and 35 inch tires with 3:55 gears.

 

im in TN, Ya i know i wont have much torgue anyways but i had more before the exhuast. I did a hughes plenum kit. But anyway if i cut down the flow with say mufflers might it stop throwin the code

 

What code is it throwing?

 

its a 1999

 

Umm! We know that, but what CODE is it throwing? PO138 right?

 

wells its the after cat o2 sensor throwin a code. But it stayed off for a long time after i did the o2 extender. I guess when the weather got hot it came back on. If i could make it flow less wouldnt the computer send less fuel and maybe not throw a code. Im trying to get around buying a two cats.

 

i dont remember the code number. It said the o2 sensor was high voltage or something along those lines

 

high voltage..time to replace the o2 sensor again. thats the exact code im throwing now and my o2 sensors have 160k on them.