i've never dropped an sr but plan on it and have done plenty of research on the engine. the s15 speed actuator is located on the differential. as far as the vvt thing the s14 came with it. so my advice is to buy an s14 and build it before you drop it, or else you'll be pulling it later. i'm not a mechanic, but i'm definately attentive when it comes to my hard urned cash.
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