[MADZ4U]

Hi All
I am a new member to this forum and can see a lot of great info on this site.
I love my Z4 35I and I am sure I am not the only one. Moving from a Motorcycle to the Z4 gives me (close to) a motorcycle experience.
I am sure what I am asking has already been out there in the forum, so please excuse my .."oh not again question".
The power on this Z4, is for me, incredible for a car.....but being an HP junky I started to look at ways to increase what I already have. I have been looking at chip tuning and particularly at the German made GAN GT.
Question is, has anyone used this particular chip set and would you need to upgrade the Intercooler to take/improve the increase in power?
Look forward to any suggestions by the forum
Thanks