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Old 11-19-2009, 03:52 PM   #16
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Join Date: Mar 2003
Location: Europe
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I don't notice any difference in the throttle response. To me the car seems like it's breathing better though.
" I know, I know, pull over !!!! "
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Old 04-30-2010, 07:10 PM   #17
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Has anyone done the same as Bad-Man-Wagon on a 530i? I have a supersprint muffler,
and was thinking to cut out the Y resonator but I'm not sure what to expect...worried that it may be too loud.
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Old 05-14-2010, 01:12 AM   #18
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Join Date: Mar 2008
Location: Jewtown
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Originally Posted by Max_VQ View Post
This part has an important function and I wouldn't remove it. David Vizard calls it a "pressure wave termination box"

On the E39 it is a 22 litre "lung" that fools the engine to thinking the exhaust is shorter than it is. This is good for throttle response and initial flow. When it is removed the engine thinks you have lengthened the exhaust by 4-5 feet.

Every try to blow through 2-3 connected plastic straws? There is much more resistance to flow than one straw.

However the V8s sure sound nice when it is removed...
you don't gotta worry about that too much unless you're doing forced induction, i saw a couple of dyno charts, with and without, there is no difference at all.
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