So I purchased this product that just recently came out around November from ripatuned. I know there’s been another post about this with a lot of negative comments but after installing this item here are my reviews… I am getting a solid 13 pounds of boost just by this sleeve. The car is definitely faster and it seems like it’s actually smoother as well. Living in Florida it is pretty hot but right now it is in the 60s and the car feels even faster. Getting an intake would definitely wake up this even more. Check out Ripa IG, he has a comparison of me racing my buddies M5. In conclusion, for a product that is incognito like this and does not need a tune it is definitely worth it. You can’t compare this set up to an upper pulley and trans/engine tune.. clearly that would be a faster setup but I easily gained a solid 40/50whp and with an intake it’ll be even more !