Unless they are heavy (2600+), most of the tube cars I've seen or dealt with have two 4-1.75" piston calipers on the rear and two 2-piston or even single piston calipers on the front. Basically just enough brake to be able to do a burnout. With 14" tires on the rear and 3.5 or 4" on the front, having too much front brake is asking for trouble. A lot of Super Stockers and even Stockers are going to 4 calipers on the rear so they can use 4 piston calipers on the front and race the stripe and/or get the car stopped without sliding the front tires.