So the 50mm Tial will work fine in my application then? I was looking at the Tial and the Greddy Type RS. The reason why I asked about the Tial being too extreme is because I saw a video on youtube where the Tial caused some surging at low boost levels. It seemed to work fine at bout 20psi though.
http://www.youtube.com/watch?v=tXqgTtHECnk