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Originally Posted by Diplomatic
yeah, I've got a 535i, the power gain was noticeable and the car had a nice growl when the engine was warm (sounded terrible cold). Made the car feel a little lighter...almost like the engine was "breathing" better. My biggest problem which was the reason I went back to stock was the smell, the exhaust smell was too much for me and outweighed the hp gain.
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Originally Posted by scott135i
BMS doesn't make a downpipe for the 550i. AR design does, active autowerks too I believe.
Trying to get some first hand impression on the stage 1 tune from BMS plus a catted or Catless downpipe. Obviously it makes more power but I'm interested in the subjective impression and would ideally love to drive one :-)
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I've had Catless downpipes on 2 bmw's before (135i's) but I'm specifically curious about the v8 550 :-)