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SouthPaw
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2,022 Posts
I'm pretty sure it is direct bolt in, since its the same engine( I assume you are using alty from B15 with roller rocker sr20) I have heard that it is an upgrade for B13's because it actually puts out a larger amperage, but Iknow the G20 is alot tighter in the engine bay so i don't know how it will fit... I dont believe the 2.5 alty will work because it is off a differnet series engine
 
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