scoobydoobie Posted May 10, 2011 Share Posted May 10, 2011 So I guess in summary that no aftermarket exhaust is remotely quiet? Look at Borla or Bosal catbacks if you want quiet. Link to comment Share on other sites More sharing options...
LOVEMYSUBE Posted May 10, 2011 Share Posted May 10, 2011 ^^ so true. It was when I started poking at the cat. to go stage 2 that all hell broke loose. Link to comment Share on other sites More sharing options...
ClimberDHexMods Posted May 10, 2011 Share Posted May 10, 2011 http://www.pontiacstreetperformance.com/psp/exhaust.html - link fixed Edit: and http://dynomax.com/mufflers.php?muffler=superturbo I'm a little shocked at how well the dynomax super turbos did in this test, but then I know nothing about how these REALLY work. Edit 2: Borla also did well, though they don't really say what model. But I have heard some QUIET Borla straight-through mufflers. Not stock quiet, but 'wow that's all for straight through?' quiet. I think ITSME or some member from SoCal has a borla welded in the midpipe, and it runs very quiet. Edit 3: http://www.hotrodders.com/forum/quietest-performance-muffler-50026.html [CENTER][B][I] Front Limited Slip Racing Differentials for the 5EAT now available for $1895 shipped, please inquire for details! [/I][/B][/CENTER] Link to comment Share on other sites More sharing options...
TRSCobra Posted May 10, 2011 Author Share Posted May 10, 2011 ^^ I believe this is the page you first intended to link to? http://www.pontiacstreetperformance.com/psp/exhaust.html Link to comment Share on other sites More sharing options...
sumfoo1 Posted May 10, 2011 Share Posted May 10, 2011 The super turbos are just peferated s bends with fiberglass insulation surrounding them. Chambered mufflers just resonate frequencies but the only gain in flow comes from larger diameter tubing not the muffler. The muffler basically hits the exhaust gasses against a series of baffles till it make the noise they want then it goes out. The dynomax ultra flow are just straight through mufflers. Link to comment Share on other sites More sharing options...
1454 Posted May 15, 2011 Share Posted May 15, 2011 Look at Borla or Bosal catbacks if you want quiet. Thanks for the input. I was thinking about the borlas till someone here said they were loud. But I may try them and see. At worst they have to be better than my current aftermarket junk. Link to comment Share on other sites More sharing options...
TRSCobra Posted May 16, 2011 Author Share Posted May 16, 2011 Here's a thread I found on an evo forum about the VT muffler. *Featuring our very own ClimberD! http://forums.evolutionm.net/evo-engine-turbo-drivetrain/493903-project-valve-technology-muffler.html Still having rattling issues... Link to comment Share on other sites More sharing options...
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