So o picked up some Magen test pipes for like 40 bucks they look like they are in great condition my only question is if I instal them would my check engin light come on they do have a spot for the o2 sensor.I also would like to know how loud would it be I have an hks knock off exhaust and it is pretty loud?

 

Well this test pipes are very much silence in case o making the things possible but I really don't have much knowledge about this. So if there would be any suggestion on this please tell me.