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Gt40r's are 700hp turbos. Thats a little bit overkill for your application IMO. A gt35r should be fine, or you could go with a gt3040r, which is rated at ~600hp.
J Chen:
A very clever idea. This must clear the alternator from a 4 in. turbo inlet. Looks like the mounting post on the new alternator fits perfectly on the 951 factory bracket. Is the pulley correctly aligned?