Turbo Bypass Valve Issues

[Jobe Tichy]

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Ever since I have owned my 20v, I have noticed a "sputtering"-like sound when
I would shift through the lower gears--kind of cool sounding.  But, I have
also had this corresponding 1.6 max boost issue.  I have read up a bit about
the turbo bypass valve being the cause of this sputtering sound because it could
the diaphram inside rattling.  I have heard there is also a corresponding
"groaning" sound with bypass valve problems but I do not have this.  Is this
normal?  Would this be a cause of a leak to where max boost was unable to be
attained if the diaphram was rattling?  I guess MTM makes a bypass valve that
is a bit stronger, probably to be used with their high boost chips.  Has
anyone had any experience with the MTM valve?  Thanks in advance....

JOBE

'91 200tq 20v

'84 BMW 318i (modified)

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