Leave the tranny oin D4, if u want a lil more umph then run it on D3. I've seen too many friends run by N dropping and raced several of them when they did it or even manual staging the tranny. Last one I ran was on the track. 2 things happened... My slow accord beat his integ.... The chasi made it past the finished line, his trany felt at home about 4 ft from the finish line where it literaly fell apart.