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I'd imagine the RB would really throw off the weight distribution compared to the SR. If you want ultimate power, the RB is the way to go. The way I see it though, well, my preference is road course racing so I'd go with an SR (lighter, etc). Another thing, if some part breaks on the RB, you'll have to order a part from Japan or Australia or something. Being that we have the SR20DE here in the states, you can get all of the parts for the DET here.
And concerning the weight thing, the JGTC GT500 Supras use Toyota's 2.0L motor(can't remember the designation). All in the name of weight savings.
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