ok on my old cavalier I cut out the cat and put an o2 simulator to tell the computer everything is running good. Now is there anything like that for the 2.4?

 

i hope so because i need one for my 2.2 i think weapon R is the only one and its $45

 

when I got mine for my cav and cut out the cat I felt a huge difference even though it was a 2.2 non ecotec

 

I think it will sound like total ass but hey, it's your car.

Do a search on "cat removal" etc and read through some of the posts. Most of the people who have tried it didn't notice much, if any sort of gain. The stock cats on the 2.4/2.0 are supposedly "high flow" already.