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Did the crios muffler mod to my '02 2.7 today. I used a long 3/8" drill bit for initial hole and then used a carbide die grinder bit welded to an 8" piece of 1/4"dia bar stock that would fit my air die grinder. Made an oval about 1/2" X 3/4". I really like the mild sound difference plus I do think it added just a touch to the bottom end to mid range. thanks crios....
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