I now have a twin turbo setup going from a N/A setup with a 4 series 12 bolt carrier. So this means I can only go down to a 3.73 gear ratio I now have 4.56's. Or do I spend the $600+ dollars to buy a new carrier so I can go to a 3.55 or 3.42? I have the tick performance level 5 TR6060 super magnum trans with the M12 ratios. So I already have a higher 1st gear ratio than stock. What do you guys think? Worth the money? It's splitting hairs but I don't want to spend $300 on gears and install kit on the 4 series carrier and wish I had dropped the coin on the carrier. And on top of that I have to rebuild the Eaton in mine now because it's started to slip when doing a burn out. Looking for the 9 second slip. Need the 9 second slip.