so you did find a leak? I couldn't find a leak at all and i still had the stumble after tons of leak tests. I'm running 1000cc injectors and the 65c dw fuel pump so that is normally when people start to see stumbles on most subarus. Glad it worked out for you. I'm going to a different fuel rail setup to see if it cures my stumble. When I was running 750cc injectors and a vf48 I had no problems. The only things that changed on my setup was the turbo, injectors, and header. I'm guessing the bigger injectors are what did it. The sd tune helped a ton with the stumble but I'm still not out of the woods yet.