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I don't know...Ive had my STS Twin setup for about 1.5years and about 5000miles on the turbos. I'm running about 9psi(574.1/594.7). Im in full boost before You can see the actual dyno on youtube(OPS TT Camaro). It says 8psi on the caption, but its actually 9. I also had the cats removed. That added 28-30rwhp. My installer tuned it for everyday drivablility, which was really important to me. On the hwy ..cruising about 70...I avg 25.6-26.3mpg. Spend the extra money and get the HPtuning software. The Diablo tune that comes with the basic package is shit.
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