If I wanted to add Dinan Exhaust to my 03 4.4, would I need an X-pipe also? Are their any other parts needed to switch out the exhaust? I'm looking to buy used and just wanted some advise.

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2005 545i Sports/Prem Package
(Retired) 2003 X5 4.4i-sport package, cold weather package, OEM trailer hitch, 20' replica metallic pewter 215's, X-pipe, Navi w/ custom splash (MUFC logo), cross drilled brembo rotors with Akebono ceremic pads.