um, i haven't really noticed any performance gaines over the stock box. I had a k&n filter in the stock box , with a snorkel delete, so very hard to tell. I think i remember reading somewhere that the cai only produces like .5 hp anyway. I just love the sucking sound it makes, sound like and air compressor and it makes the turbo whine louder too,. in my opinion. I love it and to me, leaving the intake scoop helps bring in more cold air so the temp under the hood isn't so high. i have plans to make a mini cowl induction scoop over the left side where the intake is, if u look at ur hood there is a spot of the hood where the brace is missing, alittle square piece that at the exact right place.......i'll post some pics if i ever get the guts to carve up my hood!