I went aluminum for the extra weight reduction. I heard that too about one pieces, that it's harder on some parts, but I haven't seen/felt anything that would make me worry. On the other hand, make sure your diff is mounted nice and secure, my friends decided to mess with me and loosen mine a bit as a joke, and I tore it free from the rear subframe one day while on the road.
A one piece is a bolt in part, since it's just replacing what you already have, nothing extra. If I had the money though, I'd strengthen my tranny with newer parts, but that's about it. Good luck.
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1jz-gte swap (Currently spun #3 rod bearings), Apexi high flow filter, Greddy thrust 3" downpipe, N1 3" catback with cat delete tube, 1 peice driveshaft, Bar and Plate intercooler, and 440 JDM 2jz injectors.
Possible 2jz lower block swap in the works if I can't rebuild the 1j. So troublesome.
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