Suggestions on making my 540i faster??

[E39540i]

My name is Ryan, I live in Maryland and (as you can probably tell by my username) I own a 2003 e39 540i with the m-sport package and I'd like to add some power to it. I really want to stick with dinan on this one but they are a little steep in price and I'm not sure if I want to pull the trigger yet. I already have an axle back exhaust and a front strut brace from dinan. I really like dinans prestige and notoriety amongst BMW owners so I'd like to stick with dinan. But I. Open for suggestions please!!! I checked turner motorsports website and they have chips but not for my model. So if any kind person is willing to help my out in on my quest to find more power for my vehicle, that would be greatly appreciated!!

[pseto]

Not really a lot you can do with an NA engine to make your car go any faster other than forced induction. You can however mod the driver and sign up for an HPDE.

[Nick325xiT 5spd]

Most effective solution:
Trade it for an M5.

[Dirichlet]

Most cost-effective solution: spend it on the driver, go to the HPDE schools

Oh, and IMO, FWIW, my $.02; Dinan is more expensive than it's worth. There are a lot of great options out there.