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Also remember when you go for really high gains on NA engine tunes, that some tuners run insane advanced ignition timings.
Maybe good for the last few HP, but very very bad for your rodbearings.
There is only so much you can do with a NA tune, and ignition timing mapping is probably the most significant.
If you want to stay NA, go for headers/cams and maybe a ported head.
Those are mods that do make a difference, and you could maybe get 50hp max extra (with the same revlimit)
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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