im not sure about the dumpvalve itself but when i went to bailey to get me a spacing ring to block off the standard dumpvalve the bloke asked me whether i had a c20 or a z20 engine, thus meaning that the spacer could be a different size?
I'm running 0.6 Bar boost. The DV is very quiet, so I fitted a new 1-way valve, but it still doesnt dump as loud as other LET's running same boost.
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