My 2015 435i makes this horrible tinny rattle for the first few minutes after a cold start, then it completely goes away once the car warms up. I've had two different garages look at it and neither could find the source. One said it might be a loose heat shield, another said it could be an internal baffle in the muffler. I'm tired of paying diagnostic fees without a fix. A coworker who had a similar issue on his M235i suggested I take it to a specialist that does Elite Exhaust System Abu Dhabi and knows how to pinpoint rattles using a stethoscope or even a camera. Has anyone here dealt with an intermittent exhaust rattle that turned out to be something simple? I'm worried about spending money on a new exhaust only to find out it was a bracket all along. Also curious if they can weld a heat shield without removing the whole system. Just want the noise gone before I sell the car. Any experienced exhaust shop recommendations around Mussafah?

I visit Abu Dhabi in last month there is so much heat storkes there and the temperature goes up in after 5 minutes and at night there is a cold day . 

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