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I like this thread. These are some of the mods I have considered. I hope the results are pretty good.
Available for my car there are some relatively cheap underdrive pulleys that also weigh less than stock, but I want to go the junkyard approach as well. My car being a 12si GM alternator means the main body is shared with almost any FWD GM car made in the last 20 years, so there should be some options for a factory-underdrive, and the body could be swapped for a lower output 12si or a 10si. Hadn't thought of this until I read this thread.
Regarding the water pump, one of the other "under-drive" options I have heard of is (depending on the shape/style of the pump) to remove it from the car and cut off a few fins in a symmetrical way - i.e. if you have 8 fins remove 4 of them. I recall reading somewhere that the Neon SRT4 pump is a normal Neon water pump minus a few fins.
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