Exhaust Mods
Been considering the following:
Res Delete
Muffler Delete
If you have done either of them please let me know your opinon, if you have both done even better. Or even why I shouldn't do either would be appreciated.

E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
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On my 2012 E63 I had Catless downpipes, x pipe and it sounded unreal, but we couldn't stand the smell.
Now on the 2015 CLS we have only res delete, and straight pipes, and it sounds horrible. I hate it, and can't wait to change it. So I was thinking of removing the mufflers, and bridging the straight pipes into an X pipe.
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I have never heard a 5.5TT with no catbacks so I cannot comment about it.
I would first spend $250 to do resonator delete. If it's not loud enough, it is easy to take the mufflers out and run the car to see how it sounds.
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We just cut mine out, and I was looking through them, I saw no joins or interruptions. I saw two straight through channels.



