i just got a 2.25 exhaust on and i drove the car about a mile and i came up to a stop sign and when i went to go the car killed its self and then i got it started and when i went to take off their is no power and it sounds like a tractor i checked all my spark plug's and the back two are a little black but i get spark to all of them
and i checked the air mass sensor to but it's good and would an o2 sencer do this because mine is broke and it is over heating well thank for the help

 

over heating, coolant seal?
idk if it would make the car do that though

hmm, sounds like a tractor and thiers no power, well maybe if the urbo exploded and now your running open header, but i doubt that