Mac Prochambers pass for cats?

Only if the test guy is a moron and thinks the pro-chamber is a converter.

I've actually had a friend who was pulled over by a cop get off with that. The cop looked under the car and saw the box and thought it was a converter.
 
Hell no man! I have one & I wouldn't dare go through inspection with it on..Almost got nailed at a random roadside inspection last week..my heart was in my stomach :nonono: I'm thinking it might be time to take the tint off my front windows rather than go through that again!
 
Depends on your state. Some states require the stock number of cats (four) and it won't pass the visual. In my state you just have to have a cat, aftermarket or otherwise makes no difference. I took my GT through emissions at least five time at different emissions stations and told them all it was a cat, and they believed me every time. It can be done, easily. However, it begs mention that the reason I did it so many times is that it kept failing... I couldn't make it pass the sniffer without cats, which makes it a bit of a moot point in my case.
 
depends on where you take it, a friend of mine got his through in va. longtubes and a prochamber. i swaped mine out for the visual and the guy told me he would have passed it either way.