Ok if you have a cat go to autozone and find out what that code is. I think your running really rich. yes boost leak will do that if it is bad enough.

The sound of the exhaust sound rich as well. my car sounded like that when I was flooding it with fuel my AFR was reading 10.0 cause it was so rich the gauge couldnt read it

 

alright well if this helps, we just got 20.72 mpg on this last tank of gas with moderate driving. Now if it is running rich, what should we do?

 

i think BAD boost leak.

 

how many miles is that to the tank like 280ish? if so yea that is tuned.

I say its a bad boost leak too but if driving the car doesnt feel different then that is kinda strange. What BOV did you say it hd? ad what did you put in?

 

not sure on the miles. Its a Greddy RS that i took out and a Greddy RS that i put in

 

Um... you sure? lol

 

well i took of a Greddy BOV that looked just like the one i put on except the old one had a silver recirc peice and the new one had a blue one

 

so go to autozone and have them run the code and see what the light is on for

 

wierd is alls i gotta say, i've never seen brown smoke before

 

Me neither. I would be curious to find out what it actually smelt like