Well, i think it might be diff fluid,it seems more like an oil substance and there is a good bit of it,which stinks,either way will i have to take it apart and refill diff fluid.I am surprised how much it threw the tune off regarding the re11 pipe.I got it to the point last night,when it was on the box it would idle good maybe a little high(tires slightly moving,temps were around 205,I hit the throttle and sounded alot meaner.But when i set it down to do a test run it would go about 10 feet and sputter out.Also guys when i seen the oil for the first time i noticed the rich lean screw was loose.Meaning the brass that sleeve that the flathead screw is enclosed.So i tightened it,is this a common problem.Thanks again guys your a big help to this nitro newb.