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I wouldn't think it would be that high. All of the turbonetics kits have a 67mm turbine turbo I believe. I'd see what some of those guys are doing to keep backpressure down. I'm sure most of them have never tested it. A larger down pipe would be the first step. That turbo does have a t4 .96 ar exhaust housing correct? You don't have much room for a larger turbo....
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