I've heard the single tip is quiet compared to the dual.
I had the dual and it was WAY too loud for me.
I'm thinking of going to the single tip. But I'm wondering if anyone has any db readings on one?
I've heard sound clips, but that isn't a clear indication of how loud it is.
I've heard the following on cars:
Borla Hush "Perfect"
Borla (non-hush): "Too loud"
ProDrive: "Excellent"
Greddy: "Good"
Magnaflow TXS: "not quiet as loud as (non hush) borla"

I'd really like to hear from some experienced ears.

 

Not sure but the single tip should be much less louder than the dual tip. I would guess that this would be a 1-3 dB quieter than the Greddy Evo (I used to have this).

But if you're concerned about loudness and haven't yet heard the single tip, I would just go with the Borla Hush sinced u listed it as perfect.

 

I don't know. I have the Greddy Evo and I heard a car with the single tip Bosal, and I thought it was a bit louder than mine. It could have just been me, and we didn't compare the two side by side. But when I was driving behind him, I thought the Bosal sounded a little louder than the Evo. My .02

 

The Bosal single tip is signficantly quieter than the dual tip exhaust. The Bosal single tip is the same exact exhaust offered as Subaru's STP performance exhaust ( just a different stamp).
Probably a bit loader than the STI stock exhaust.
If you are looking towards cost, performance, and low noise... this is a good option.
I believe it is just a bit louder than the Greddy Evo, Prodrive, and Borla hush. Yet cheaper for the catback than any of the 3. I recently got the Prodrive, because I thought the Bosal might be a bit too loud, it turned out to work great - even with the Bosal D/P, it was wife approved! She loved the sound and new power. My recommondation - get the Bosal D/p and Prodrive or Borla hush *** end.

 

I had the bosal single tip for a while and it was louder than the greddy evo for sure. Not significantly louder, but louder none the less.

I wouldn't recommend the Bosal if you do a lot of highway driving. It has a nasty resonance at about 3k rpms (right around highway cruising speed). It's not terribly loud, but after about 15-20mins on the highway it gets very annoying. I thought it was just me until I had 2 different WRX drivers in the car with me ask why my exhaust seemed so loud... I went with a stromung exhaust after and it's great. Quiet on the highway and on light throttle, but when you really get on it, it makes its presence known.