needing some help

[bigdawg181]

i'am new to the mazdaspeed3 word. i would like to know if someone can tell me will removing the two cat will give me problems (ecm codes)ect..

 

[numbnuts22715]

Im pretty sure it will throw a code, either for a bad o2 sensor or an insufficient catalyst system. If you get an aftermarket exhaust and downpipe, I'm pretty sure some of them come with a fix for it.

 

[bigdawg181]

thanks dude... do u think if i use a o2 delete it will b ok

 

[SharkDiver]

you can remove the 2nd cat and have no problems but there is a O2 sensor after the 1st cat so it will throw a code if you remove it.