Ordered a pre catalytic converter thru rock auto made by bosal. Arrived today shipped directly from bosal. Converter was inside a much larger box. No packing material inside at all. Converter was bouncing around inside box. Nearly broke thru box. Dont know how the ceramic inards of the cat didnt break up. Cat itself was poorly made, bad, sloppy welds mounting flange was heat warped. No way it would have sealed. For $350 it expected more. Called rock auto. They were great. Emailed me a shipping label. Full refund upon their receipt of it. This is for the wifes sentra. She has been driving the v10 truck until i get hers fixed. That 10 is thirsty so every day i am delayed means $$$ for extra fuel.