I just got true daul 3in exaust from the cats back to 2 delta force race mufflers. Before I had an Imco 1-2 with a y pipe. Nice improvement cost about $600 all said and done. Any advice on changeing the cats?
2005 F-150 5.4li
4x4

 

I got two Hi-FLows and I am extremely glad I did it. Very cheap and awesome improvement in sound.

 

Where did you mount the o2 sensors before or after? Mine is built into the cats

 

The o2 sensors unscrew. There are sensors in front and behind the pre-cat.

An exhaust shop should be able to swap the pre-cats with two highflows, and delete the post-cats.

 

ok. I have 2 HUGE factory cats. The o2 sensors are before the cats and the second pair is directly in the middle of the cats. I want to go headers and high flow cats but not sure the placement for all four of the o2 sensors.

 

Should only have to have the 2 o2 sensors. I have an 04 so I have 4 cats. little different for me to work with because I still have two of the factory cats still on it witht the two Hi-Flows.