YOU have hit full spool @ 3.7k? Or the turbo is advertised at hitting full spool at that? The dsm guys also have MUCH better flowing heads that help spool. Not to mention some of them rev to the moon. Friend of mine had this turbo on a srt4 with supporting flow mods, and the dyno looked like a honda hitting vtech. The turbo hit HARD and held through redline, but the spool was terrible.
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