I have a 1984 chevy g20 3/4 ton I want to put the side exhsust like I use to see in the 80s when I was a kid. It was the coolest thing to me.
The engine in mine is a gen 1 small block 5.7l 1995 model it has one exhaust with y pipe and one o2 sensor.
would I have to add 2nd o2 sensor in a state with emissions. I want the side pipes to be Separate not have a y pipe.
any suggestions would be greatly appreciated.

 

I would say so. The emissions looks at both sides of the cat. I don't have emissions in my state, so, just a guess. You might look into having your truck 'grandfathered" and bypass state test.

 

I would say so. The emissions looks at both sides of the cat. I don't have emissions in my state, so, just a guess. You might look into having your truck 'grandfathered" and bypass state test. The ecm might be an issue.