This is all just my best guess as to what they were thinking... they wanted to put an I6 in it without developing another one themselves. I'm not sure how enticing a 311 hp NA V6 is these days without adding a turbo or two, and they'd have a whole different group of people in tears had they not gone inline. Either way they probably realized they would have to develop a new 3.0L engine of some sort. The B58 was already there, I6, turbo, and probably hit their power goals/is cheaper than say the S55 or S58.I agree ^ with the comment above as Its a great point. The Supra lost alot of its Supra Toyota feel with the heavy BMW influence. Lexus makes 6 cyl’s and I wonder why they didnt put the IS350 engine in the Supra? Possibly it wouldnt fit but in my view of it had a lexus engine alot more people would be buyers.