Hey All! While you all addressed the need for the weep hole(as a cold exhaust system warms up condensation forms,also one of the reasons vehicles in winter climates that don't get driven to full operating temp may lose a muffler a year) no one seems to have suggested the rear gate weather stripping(gasket,if you will) The design of this unit and the dump location of the pipe along with the natural airflow and backdraft will allow exhaust fumes to enter the cabin! So ComputerNerdBD may very well be experiencing CO in the unit!Esty had a great suggestion however! Check the rear gate seals& throw in a CO sensor! Let us know! step66

 

Would also explain why my Sirius antenna is causing water to leak into the cabin from the roof. I used to have it routed between the door and the seal and later behind the seal on the body so it didn't pinch it, but when I replaced the antenna I used the top LED stoplight wiring hole on the passenger side and used RTV when I put it back together. Maybe the bottom is also bad and the previous routing caused a problem? OMFG. Tell me that isn't a dealer-only item. Sometimes water still leaks into the trunk after a car wash with a high pressure wand.