[Batman]

Are you running an automatic? If you are there is no reason to spend $2000 on a 12 bolt for 400HP. Pick up a 9 bolt, get the gears you want for it and buy the new T/A girdle it will last you years if you don't run slicks. If you are planning on using slicks then you need to get something aftermarket. The 9 bolt is a very good piece of hardware. It is not as strong as a 12 bolt or ford 9 inch but you won't be out $2K + for it and it should be more then enough for a 400HP car with street tires if it is an automatic.

If you are running a T5 suck it up and get a 12 bolt.