i have a synapse and it functions flawlessly and sounds great .... on low partial throttle it makes the spooling noise louder too hard to explain but the way it works on pressure of the air it is partially open at low pedal and low rpm and sounds sick... but does no leak a smidge under any type of load...
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08 135i 6m - 12.1@120.2 2.0 60ft - JB4/Meth - SOLD
09 335i e92 Mtech - RB FBO
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