What turbo charger to install on my 2005 Z4?

I have a 2005 Z4 3.0 and I want to give it a little more HP and want to know if anyone has any experience with Turdo or Super chargers? I am leaning towards Turbo chargers and want to know if there is a brand that stands out as a good quility for the money.

There are no mainstream turbo kits. Technique Tuning makes a good turbo kit for the E46 3 series, and I've contacted them about adapting it for the Z4. You'll need access to a quality shop. Quality as in, there are only a handful in the country, and be prepared to drive and leave your car for weeks. Other than the TT kit, I know of no other mass produced turbo kits for this engine, period.

I suggest you read up on turbochargers vs superchargers, and the different types of superchargers. There are roots, centri, screw... all kinds.

I have the VF supercharger kit. It's great if you don't want to upgrade and like centri blowers. The engine should last a long time as I'm barely adding wear and tear around town, but when I push it I'm only using 6 psi at redline. ESS has a more powerful option that is quite a bit more expensive. It combines the low-end boost of a turbo with the no-lag benefits of a supercharger. The ESS kit also has multiple upgrade options, like intercooled stage 2+ kits and make use of cams (which add 20-30 rwhp on 8+ psi of boost).

Thank you for the info do you have a link to the VF supercharger kit that you installed? And this kit will work on my Z4 correct?

You did not mention but is your car Auto or Manual. You will be seriously limited if it is Auto. I went through the same search with my 04 3.0 and found for the Auto it was just cost prohibative to get only 10-15 extra in HP.