How much worse will my emissions be when i put on the turbo. Anybody done this and still passed emissions??

 

Depending on your tuning and emmissions controls, it could pass easily or fail miserably.

Tuned on the leaner side with a cat converter, it will have no problem.

 

Yep, it all depends on your tuning.
If everything is tuned, correctly (doesn't have to be on the lean side, because that could cause you to fail as well) there is no reason a turbo would make you fail emissions. (assuming all emission control devises are intact)

 

I mean lean when it comes to turbo tuning, not so much lean in the stoiciometric sense.

 

i couldnt pass for shlit with my turbo and its tuned really wee. I had to gut my bov so I wouldnt boost and dial down my fuel pressure in order to pass. Passed though with flying colors after that

 

Now some of the newer turbo cars from the factory have 2 cats. One RIGHT after the turbo and the other in the normal location. Along with an extra O2 sensor. If i install an extra high flow cat and run the stock cat, will this let me pass no matter what boost i run?