Originally posted by DocSVT:
whats the best way to go about this,im guttin mine tomarrow? 
Check the how-to link above, it's pretty thorough. Bnoon used to sell gutted and cleaned pre-cats with a core exchange for pretty reasonable. If you're gutting them on the car, beware of the risks and try to vacuum the sh!t out of the pre-cat shells often to minimize dust buildup.
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