Id def go gm, when I replaced mine last year it was pretty straight forward. I just took out my fans but I also replaced my opti at the same time. While uou are there you should at least do a cap and rotor on the opti. I have a new gm cap and rotor you can have if you want. If you can and if you do decide to changevthe cap and rotor go woth msd they can handle higher rpms better than stock thats what I changed my new opti with.
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