Speaking first hand here, those big 6's are TORQUE monsters!
You won't be dissappointed and IMO it would be easier to build/maintain thean the Turbo option.
Ofcourse, you don't get the cool "swoosh" sound, but the music that the 6's produce with an exhaust, is enough to make you forget about the "swoosh".
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--'00 BMW ///M5 .:Jet BLK/BLK:. Individual-1 of 1 - Style 65 Wheels; 9.5" Square Set up;275 Tires;10mm/3mm Spacers; Black Kidneys;Muffler Delete; 3.5" Dual Tips; Beast Power; "Dinan" Ducts; E60 SSK; BC Coils
--'00 BMW ///M5 .:Avus Blue/Grey/Black:. 1 of 8
'88 BMW 635CSi Blue/Tan Sport
'81 MB 500 SEC Euro Koenig