I dont know, from what I researched when I was looking at boxes, dog boxes are very high maintenece, especially if driven on the street as they don't select gears well. Also unless you opt for billet selectors they have an even shorter life span. I am pretty sure SydneyKid was saying they strip their boxs after almost every race meet as it's necessary to check for problem components...and iirc he was talking about how they had to replace items rather regulary as they started to wear down. I think they are perfect for track only cars, but a bit of a problem for street driven cars.