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It all depends on the dyno, a Mustang(reads way lower) and a Dynojet(higher). Also depends on if you have 91, or 93 octane. Density altitude plays a huge role as well on dyno numbers. Just to put that into perspective, up here at ~4500ft altitude with 91 octane, running a low reading Mustang Dyno. A 2013, 662hp Shelby GT500 dynoed at 475WHP.
Don't forget the 235 already comes "tuned" with a 20hp/30tq power bump over the other N55's in BMW's lineup.
I would think realistically with 93 you could gain 20-25hp and 30-40tq. A little less with 91.
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