Will removing the front 2 pre-cats and replacing them with a piece of pipe mess with the O2 sesors right in front of them. I was guessing that since the sesors arn't located on the cat itself it shouldn't be a problem. Is this right?

 

First I don't know if where you live if it is illegal. Also, I believe the system relies on backpressure/temperature created by the entire exhaust system. I think that by removing the Cats you could change that temperature/pressure.(maybe a tuner could help balance it all out) I know there are some heavy fines if they are removed in some states. There may be some High flow Cat's available. Good luck

 

my truck has 4 cats currnetly. i was talking about taking out the front 2 to make it a little louder until i get some high flows to replace all of them.

 

I removed my back 2 cats. Runs fine.

 

Thanks, I'll look into that as well. Souns like a good option.

 

Where are your O2 sensors located? I have an 01 screw and the sensors are in the middle of the back 2 cats.

 

Removing cats is a mistake. Loss of low end torque - I had them removed for 2 months, and then put hi-flows on... What a difference. Go with high-flows.