Join Date: May 2008
Location: Southern Illinois
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I have taken the Muffler off of my 03 F550 I can really hear the turbo and around 2600+ rpms she starts to growl at you. I still have the CAT in place for now. I don't know if I want any more sound out of the truck or not. I had a few fellas tell me yo uare better off without the muffler than without the CAT. said the CAT in the 03-07 6.0L were not all that bad.
03 F550 XLT, Tuscany Conv. Hauler Bed, Custom Interior, Flip down DVD, Air Bagged Rearend, LED lights, Pioneer Z1 Nav. SCT Xcal3 with Innovative Tunes. S&B Cold Air Intake & Muffler delete, I still have the Kitty
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