If you put them before the cats you will have to have it tuned properly!!!
Originally Posted by GreenMonster If you put them before the cats you will have to have it tuned properly!!! You can just tune the cats out....I had my cats and rear o2's turned off in the tune for like 5 months before I actually took them off. No big deal there.
T-RAV99 GMC | 5.3 | Skinny White Guy Tuned
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