exstension box question
 

just the new guy again due you guys have any thoght on my 27 mag sport..................the drive is a #3 speed master and the fuel cells are on the sides of the motor due you think a exstension box would help in performance. I dont plan on going to crazy with power maybe 550-600 hoarse, i noticed that the old grumpy old men and the new captain morgan mag are set up this [email protected]