Like regular Hedman TURBO Mufflers, these Hedder Mufflers are high quality turbo-style mufflers. They come from the factory with a 12" head pipe welded on, and an integrated collector.
 
Part # ProductTube DiameterCase LengthColorEngineExhaust System DiaFinishInlet DiameterLengthOutlet DiameterInlet Inside DiameterInlet OffsetInlet Outside DiameterInlet Pipe DiameterInlet QuantityOutlet Inside DiameterOutlet OffsetOutlet Outside DiameterOutlet QuantityOutlet Size(s)Shell Diameter HeightShell Diameter WidthShell Length Media
25660 Turbo Hedder Muffler for 2-1/4" Exhaust System; 3" 3-Bolt Triangular Collector 2-1/4"Galvanized Steel2.25"28"3"2.25"Center2 3/8"2.25"12.25"3 1/2"2 3/8"12.25"4.50"10"14"
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$65.22
25662 Turbo Hedder Muffler for 2-1/2" Exhaust System; 3" 3-Bolt Triangular Collector 2-1/2"Galvanized Steel2.50"28"3"2.50"Center2 9/16"2.50"12.50"3 1/2"2 9/16"12.50"4.50"10"14"
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$66.78
25667 TURBO HEDDER MUFFLER 2 1/2" EXHAUST; 3" BALL & SOCKET STYLE HEADER COLLECTOR 14"2-1/2"Galvanized Case28"2-1/2"
$80.07
25666 TURBO HEDDER MUFFLER 2 1/4" EXHAUST; 3" BALL & SOCKET STYLE HEADER COLLECTOR 1-1/4"14"2-1/4"Galvanized Case28"2-1/4"
$78.50
 
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http://hedman.com/images/ePIM/original/25662.jpg