try the lag from a T61.... hits full boost at 4.5K..

either way, your set up sounds pretty legit, and you should make the power you're looking for pretty easily...

you're right about the 400 walking a lot of cars though... but after a while, you get the bug... every day 400 starts getting slower and slower.... lol...

keep me updated on the new shell... i'd like to see/watch the direction it takes in your hands... GL!