Id suggest Garrett, if your looking for sizes thats a whole other ballgame since you didnt say if you were into journal bearing or ball bearing also if you want to go smaller on the twins for a faster spool or a larger set to support 4 digits. A pair of gt35rs will get you your 800 hp with room to grow and on that motor should spool up fairly quickly. The bill for those turbos aint cheap though at roughly 2700 bucks for the pair. Turbos as with cams are a tradeoff, you gotta give up power in one area to gain it in another and sometimes its not that big of a deal and sometimes thats what breaks you. hope that helps
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