Diamond Eye Quiet Tone Resonated Front pipe - 321040 FOR 2001, 2002, 2003, 2004, 2005, 2006 & EARLY 2007 CHEVY/GMC 6.6L DURAMAX DIESEL 2500/3500 4" ALUMINIZED - PERFORMANCE DIESEL EXHAUST "QUIET TONE" RESONATED DOWNPIPE