I just put in a high flow cat, now sometimes I get that rotten egg smell that is often attributed to a bad convertor. What'* the deal?

I had that problem too, usually attributed to a wonky O2 sensor

I thought that smell was normal with new catalytic converters. Isn't that why most new cars have that smell untill the converter wears in.

I guess that would explain it.

Yeah i hope so, that is honestly what i have heard from many people, but to be safe you could try calling up the place where you got it from and ask them if it'* normal. Cause if it'* a high flow cat you probably paid decent coin for it so you don't want it to be faulty. I would say im about 98% sure that it'* because it'* new though.

That smell is the new chemicals mixing inside the cat (not completely active). They do not completely filter the exhaust gasses until you have driven the car for quite a while. I believe the break in is close to 1000 miles, but I have heard different opinions.

Or a new Bosch O2 sensor.

You know what dude..it probably was

I think Will and some others have tried the Bosch O2 and it smelled bad and wonked out in a month.

Ac Delco, put in by myself last fall.