When I enquired about an ECU tune I was quoted an average power increase to around 520hp.
I've read a few posts ago that that is the average with the ECU tune and "secondaries gutted", which suggests the ECU tune alone won't give that figure.
So, definitively, what average power increase does the ECU tune alone give a standard C63?
I've read a few posts ago that that is the average with the ECU tune and "secondaries gutted", which suggests the ECU tune alone won't give that figure.
So, definitively, what average power increase does the ECU tune alone give a standard C63?