New turbo

If you want to spend the coin and want something more up to date- 5858 will work, but the best performance would be changing the converter also.
But then your goals with the car will start to come into play in what you want to do with it.
 
6131E will as well. I have one of those for sale with about 2k miles on it and less then 25psi pushed out of it
 
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