Yeah you are right turbo, but it isnt the top end that is more of a problem. Taking off will be the harder part. My bud used x-pattern's and it wasn't nothing for them to get loose. With a 2-speed, the tallest ratio u could use for first is 15/44. I am currently using that right now seeing how it is the better of the piss poor ratios available IMO. My sts mt12 breaks all 4's loose if i nail it from a stop and at slower speeds. My car is really hoped up but no matter. The .21 will get em loose no matter what ratio you have. Set-up is also important. When it takes off bad out of hell, u want it to go as strait as possible.