Out of interest are you looking for pure 0 to 60 improvements or other ranges 50 to 90 etc?

I have a full Quaife set up on my E53 and that allowed me just over a second improvement in the 0 to 60 range simply by letting me floor the accelerator without losing any traction. This made up for not having any fancy modern computer controlled launch control.

Of course having a few extra horses under the hood also helps so maybe some engine upgrades?

SB

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5.0L E53 2003.

Hobbies include visiting lots of petrol stations.