Yeah my friend and i both have to grind down that extra casting ecs tuning says some housing have extra casting. They should disclose this so people will know and not have to pull the tranny twice.I have that kit, and when it was installed there was no extra work that had to be done. It just popped right in.
And boy has it made a difference. I may have to consider installing an LSD at some point too. Yummo