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Originally Posted by Tcat55371
So what does this get you and do all the stock ones crack?
Is this something I should be looking into also? I have a 92
Not to hijack your thread, just asking because I dont know.
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The light weight stock size ones theoretically should allow the engine to rev up quicker due to less rotational mass.
The underdrive ones should free up some horsepower by reducing parasitic losses by the power steering, alt., and AC.
You won't feel either gains by the seat of your pants. You probably would not see either even on a dyno.
Replacement with a stock subaru pulley is the safest option because you retain the rubber dampener. There has been quite a debate here and on other forums on whether going to a one piece pulley will eventually destroy your engine. So far we haven't seen any failures.
The one piece construction guarantees you that you don't have another pulley separation like with the stock pulley.
It is common for the stock pulley to let go but not guaranteed. I've seen alot on here breaking over 125k or so but there are also alot of them still running with many more miles than that.
Just keep an eye on yours (listen for squealing on startup or in turns) and if it does break you know your options for replacement.