Stainless steel Mandrel bent Optional Resonator Polished 3 Chamber muffler 1/2" Hangers in all OEM locations Includes all required clamps and gasket Direct bolt in when used with a stock exit downpipe During the testing phase we setup an RTA to measure db levels at various frequencies and rpm ranges . Time consuming to say the least but in the end we came up with a solution which we now manufacture in stainless. This is an amazing sounding exhaust while still maintaining a quiet tone when it is ordered with the resonator as a stock replacement. Running this 2.5" catback with a catted downpipe, and resonator option is quite tame at idle and cruise, but louder than stock.  Fits the 2005-07 2.0 (LSJ), 2005-2010 2.2 & 2.4L Cobalt's; also fits 07-10 Pontiac G5. March 2025 update: We have updated our muffler section with out new double wall muffler tip for a more modern look. New tip featured in product photos. *UPS shipping only Sound Clip with ZZP Cat'd Downpipe, with resonator Sound Clip with ZZP Cat'd Downpipe, without resonator