Heres the situation.. I have a invidia downpipe and APS exhuast. A couple weeks ago I noticed smoke coming from the engine. It was smoking around the downpipe, turbo, trans oil. I checked the trans fluid and it was very low so I got some trans oil and waited a couple weeks and now the smoke is back. Anyone have any ideas on what it could be.
I am hesitent to bring it to a dealer because my CEL light is on from the cat and I heard they don't won't look at my car because of this.

thanks