I've got an exhaust on my #2 header flange and I'm up for smog in like 2 weeks and I really don't fell like screwing with it since I'll be installing new heads in about a month or so anyway.

It's very obvious on cold start when it's like 50 degrees, but when the engine is at full running it's not noticable unless you are under the hood and know where it is, which the smog tech will be under the hood.

My question, since it's this small once warmed up, will it be sucking in enough air to increase my o2 amount enough to cause me to fail?

 

If the leak is on the #2 hole, it shouldn't affect the O² sensor, as long as the sensor is in the stock location (on the opposite bank).

 

True however what if it's sucking in enough air into the exhaust to cause too much o2 coming out the tailpipe? See in CA you fail for having too much plain oxygen in your exhaust. I know it won't effect my BLM's....

 

fail for having too much o2?


now isn't that a crock of cow dung

 

all smog testing is a crock.

 

No, you'll fail for having too much NOx. That's not pure O2. NOx is when you are too lean in your chambers and the temps get too high. EGR helps this as does retarding timing.