Originally posted by stilov:
None will enter the engine or anything right?
Maybe if you ask it nicely it won't 
This is one of those things you don't want to half ass. Yes, if you don't get all of it out, there is a very good chance it will be sucked back into the engine, which is very, very bad. Alot of people will tell you you can leave them on the car, and even not remove all of the catalyst material. But, IMO, if you're not going to do this mod right, don't do it, as it can end up destroying your engine.
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