I have a question for some of the more experienced tuners. I read that the DSM BOV is almost the same as ours only metal and it dosent leak. I purchased one to test the difference between stock and the DSM. I had to set up an elaborate piping systen to adapt the large port on each BOV to be under pressure. I then applied vacume to the valve and noted at what pressure they start to bleed boost. To my suprise the stock valve when to -11psi before it leaked and maxed open -15. The DSM leaked at -10psi and also maxed out at -15 but it was open way more. The valve was used, so that may account for the 1psi difference but maybe a new one would be the same. I would assume that it could handle more flow at it's max opening which may help performance when shifting by preventing compressor stall. I have heard that there is an inexpensive modification that enables you to change boost levels with this valve. I like that with some black paint it would look stock, it's even a little shorter that the stock valve. I noticed that aftermarket valves are so big that they push on the intercooler cover. No such problems with this one, only modification made to fit is the holes need to be reamed out slightly. I only installed it for fit. Any comments on where I can find this info.