Does Stillen Gen 3 CAI cause you to run lean?

Originally Posted by cameronZ

Yeah man after I threw those on I started getting some black soot coming out of my exhaust tips. They throw off your AFR ratios a bit because they move the MAF sensors. During my tune they said I was a bit lean. Running lean can theoretically cause engine damage. But again, it depends how lean you're running and how hard you push your engine. If I were you, id wait until I had the money to do the tune as well or I would just get some drop ins and get like the AAM midpipe, you'd have a full catback with test pipes and you wouldn't need a tune.