you cant tune for a bov.

Silverrex is right. those are the symptoms of a blow off valve. and dont thing that a little rich isnt all that bad, being rich can be just as detrimental to your engine as lean, it just takes a little longer. one of my pistons cracked from caked on carbon deposits which then caused me to burn oil, all of this from running a bov for about 50k miles.

the sound is not worth it.