just wondering if i could get someone to say first-hand what kind of sound differences they experienced?

i'm hoping it stops the 'trumpeting' that comes with the standard O/R H...

thanks

 

I first had an O/R Prochamber and I was getting trumpeting. Although I had Flowmaster AT's, and chambered mufflers seem to amplify the trumpeting, because I put my stock mufflers back on and it didnt trumpet. I sold my Prochamber to a member on here and I believe he is using it with a mid-muffler setup and the trumpeting is gone.
Since I have switched to an O/R h-pipe with Flowmaster 40 series, and I still get trumpeting, but have just learned to live with it.

So pretty much I think it depends on what type of muffler you run.

 

The trumpeting is here with a o/r prochamber. No doubt. But only above 3000 rpm.

http://www.dailymotion.com/Enitalp/v...aust-test_auto