Originally Posted by seahawkfan94

I took my B6 3.0 Ultra-Sport into Sunset Audi (Portland) 3 times, because they couldn't target where a rattling in my exhaust was coming from. At first they thought it might've been a heat shield underneath the bumper, above the passenger-side muffler. So they tightened a couple things, but it was still doing it. I took it in yesterday, because they diagnosed that it was most likely something that had broken off and was rattling inside the resonator. So they ordered a new resonator/piping that I believe goes from the resonator to the mufflers. (Not exactly sure 'cuz the service guy wasn't positive on the 3.0's what the parts include).

Anyway I get a call/voicemail saying they replaced the parts, but the rattling is worst. WTF??????? I'm not mad...I'm good to go for now in an '07 Cadillac CTS 3.6 V6. But what the hell is wrong? Anyone else have a similar problem?

They're not sure exactly what's wrong, and will call me 2mor when they know more. If they end up having to replace basically the whole exhaust (It's all under warranty thank god) I'm thinking about upgrading to the SuperSprint exhaust (Audi's upgrade).

Anyway..again...anyone have any idea or have similar problems? The whole thing's been really weird and obviously not a common problem.