I am currently running a cheap TiAL copy BOV. It works well but it's obnoxiously loud and "flutter-y".

Any recommendation on what I could replace it with? I am looking for something as silent as possible.

 

Diverter valve.

 

I use an Audi 710n diverter valve, manufactured by Bosch. Was able to get it for 25 euro second hand. Prefer it over a much more expensive Forge BOV that I tried before it.

 

plumb the BOV pre-throttle body to keep it closed. It won't make it much quieter, but you'll be able to hear the turbo and its free!

 

Maybe try a motorcycle prefilter sock or just a uni foam style filter over the bov, or build a shield with sound absorbing material on it to direct noise down? Or switch to a bypass valve. Which technically will improve spool/throttle response. Or a hybrid valve. All bov's make noticable noise so I don't think it's worth switch it out for another.

 

My real TiAL Q bov is very quiet.

 

My MSM came with an HKS SSQV (?) vented to atmposphere with a purple insert that was supposed to accentuate lower frequencies. It was LOUD and the GT2560R spins up quickly so it was easy to startle pedestrians and annoy anybody in the right lane with their window down. One of my first modifications was to cut the center out of the plastic insert and smooth out the remaining lip using some JB Weld. The sound is of course louder than recirculated but sounds just about as smooth. It no longer screams boy racer, look at me. If there the airflow exit isn't smooth you might take a Dremel sanding drum to the inside and if that's not enough, think about recirculating it as nothing will be as quiet as a recirculated BOV.

 

OP, can you show more pics? I'm curious how your routing is set up.