Exhaust help

[Grandamn]

Been alot of talk about this but yes on my 04 grand am ecotec there is deff a pre-cat. no if ands or buts about it.
What can i replace this thing with without throwing a code?

[3 DeeJay]

pre-cat... hmm no idea about that but I had straight pipe from headers back put on my car..

[Grandamn]

what about your o2? did you get a sim?

[Grandamn]

also how does your exhaust sound?

[3 DeeJay]

Everything was fine and didn't bother the o2... It sounds... opened... you can barely hear it from inside and I've never had anyone else drive the car so I could hear it from the outside.. so.. *shrugs*

[urweak]

theres a "pre-cat" go take a picture or something, you are probably looking at your resinator and thinking its a cat or something.