Hi Ronnie.
The Robinhood one won't pass IVA
I've got the same silencer, and it only just passed the SVA test.
I know the IVA is a lot lower. As Ash found out.
I fitted the Sierra cigar shaped first box, after the test.
See my pic on FS post
Defo made it quieter, Still not sure it's IVA friendly though
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David.
Heaven, Warm days and Cool rides 
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