FLOWMASTERS!! Are there 3 kinds of 40 series 2 chambers??

[MiracleMax]

Then thats the difference. the delta's have the additonal baffling behind the primary wedge in chamber. I suspect that they improve flow by reduxcing turbulence but the additoinal baffles also change the way the muffler resonates (much like the way you change the the notes on a musical instrument). Course my theory on that is if it makes more power whats the problem. My bro used my old Dr. Gas-X crossover and some of the local yokels joked him about it. To bad for them that it pumped up his mid-range a huge amount compared to the dual system he had before. It took a bit of getting used to but I prefer the sound more and liked the power improvement even better