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I pushed the limits and ran 18 PSI on stock internals with a Borg Warner EFR 6758. That was after running a Sprintex 210+ or SPS kit on 69mm pulley. All tuning completed by Delicious Tuning.
People will say it's a ticking time bomb but really, the amount of boost etc means nothing. I had a friend who blew his engine up N/A just driving normal. I've heard of cars sitting on cruise control on the highway bending rods. I know amazing tuners that have only run 7 PSI on theirs and bent a rod (that particular one was a track vehicle though)
There's a tuner in Aus near Sydney who runs about 313kw and 500nm to the hubs and tracks his car and hasn't had an issue.
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