My tips seem to get dirtier a bit faster after going stg2+.
So a bunch of people have videos posted before and after downpipe installs. I have noticed that the "after" videos show noticeable exhaust that was not there in the "before" video. I am wondering if this is just oils/whatever burning off as they are fresh parts or if it has to do with higher flow cats? Would the exhaust go away after good initial running and getting everything nice and hot?
I had some smell and light smoke initially after the install. Once the lube and oils burn off, I think you'll be fine. I haven't noticed any continuing smell or unusual output.
Most of the time is the lube they sprayed on there, and the exhaust is burning it off. Like Hardknox said, after 1 to 2 days of driving , you will be fine. What kind of aftermarket downpipe you have or you looking to purchase? Feel free to pm me if you have any more questions
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They have a protective coating on the metals that are just a bi-product of the manufacturing process. This will burn off and create a smell and a little bit of smoke. Nothing to be alarmed about.
The other reason is that most people are so anxious to shoot these videos, they shoot it right after they installed the system. So your car naturally emits a little bit of smoke on a cold start. If you were to drive the car around and then do the video, there would be less/no smoke. This is the same reason that your car idles a little higher on a cold start, to warm the engine. Everything doesn't work as efficiently when it is cold, as it does when it is at operating temp.