Lots of supra owners stick with twins and i've seen them go over 1000rwhp personally. What's your point? The layout of the motor isn't wonderful for a single setup, piping cannot go larger than 2'' in many areas, without the aid of some serious fabrication. I would think it would be different, responsive, and a possible cheaper alternative with everyone ditching their tdo4's.
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02 WRX
K&N, ic hoses, up-pipe & turboback