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Discussion Starter #1
I have a E99 73 164k. DIY intake 4" turbo back. I have a TS 6way with factory tunes. It's a six speed. SOmetimes when I lay into it I get black smoke and sometimes it's greyish and not verry much. Performance wise it feels the same no matter what color it is. Any ideas?
 

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WNY Biodiesel Co-op
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Performance wise , does it feel down on power ? There are many factors that will produce black vs greyish smoke, like outside temp. , fuel quality etc. As long as its running good ,I wouldn't worry about it unless your loosing coolant or it runs rough and missing. My truck usually pushes only a greyish smoke , but then I'm running 100% biodiesel.
 
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