Hello Tom
I will say I absolutely guarantee you wont get 380 with just a remap on an accurate dyno (in UK dyno's), just not possible (remap is circa 340/350) I got friendly with Stan at ecotune and I've looked at many many graphs before and after, the D's that come in range from 280-290 ish, if its evolve or DMS figures i can well believe it
Before on mine bog standard 284, after 372/565 with remap+DPF removal EGR delete and air guides.
I dont think 400 is possible really, you'll get damn close though, i recall a D with remap, DPF delete, EGR off and Wagner IC it made ~386.
If you added meth you might just might hit 400
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As above tranny is rated for 600LB torque after that your pushing it really, but you have a different diff which is good.
You joking you D will destroy a e46 M3.
I havent had a go against many cars, but left a remapped FOCUS RS, and 08 plate subaru WRX STI comfortable.
Awesome car!, i get 35MPG too but drive economically.