I don't know if streets are glass packs -"BUT"
My Magnaflow streets actually sound much better after being on my car for 5,000 + miles. Slightly louder, Much deeper and just have a great tone to them. I just went on a nice ride to Orlando on a very rainy morning. I left the house at just before 5:AM and took the back roads and just kept it about 50 MPH and listened to the growl of my exhaust over the great 60's music on my sirius radio. No other cars in sight. You really have to tune your ears to hear the mufflers because they are not intrusive and obnoxious sounding. Just a nice hummmmmmm.
Like I said, I don't know if the Magnaflow streets use any packing or they are chambered but they sure sound good.
2012-candy red- V-6 MCA, Automatic Trans. CFM Valve cover breather. MMD blackTail light trim.Magnaflow axle back street mufflers, JLT oil catch can.MMD hood struts.
Airaid Cold Air intake. red caliper covers, 3.7L performance engine cover, Flat black hood spears.Boss 302 strut brace, CDC rear panel, Trunk Cargo net,--Dash carpet cover,
Viser stickers to cover ugly yellow warning crap,Aluminum driveshafft and Swarr Bar.