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72 Posts
I did the deckplate mod about a month ago and had no problems but when I install my flowmaster 50 series muffler it took about 3 tanks of gas but I notice a rattling nosie coming from my engine compartment. First thing I did was put the deckplate back in to see if it help and after about 2 tank the noise went away. Just woundering what it might have been. I have a 2004 ext cab with a 3.4 no other mods. 