new exhaust
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Joined: Dec 2010
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From: baltimore OH
new exhaust
I am planning on buying MBRP pro or the xp 4" turbo back system. I have a 2004 ford excursion 6.0 with a brute force cold air intake other than that i am all stock. My question is that I see you use factory cat now does that system come with the fittings to reduce back to the inlet and outlet size. I see on some you can get a test pipe for that spot. With my truck what should i do? What will it do to my truck if I don't run a cat?
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