Got my Dragy today pretty cool. Tested it out on my 2008 335xi this is with Full tank heavy sub/amp/enclosure in the trunk with tools 10 qts of oil for my next oil change and 2 big car seats in the rear seats for kids. Stock turbos. Low 2 psi spool at launch also via jb4 on my tablet mounted. Funny I let off cause the road was to rough to do a 1/4 mile but it still registered a 13.5@66 mph trap speed lmfao 1st run ever. Btw i am on e50-60 fuel e85 BEF FBO+inlets running 22 psi midrange 18-17 redline (maxed out). This dragy for 150 bucks is darn cool says accurate to .01 seconds..