There are 2 kinds on the market. One is a "bleeder valve" type and one is a "ball and spring" type. There is one I found, called the TurboXS High Performance MBC which uses BOTH systems in one unit. Which one should I get that works best?

 

The Turbo XS manual boost controller are great for the price. I have a TurboXS BOV and love it. Choose which ever one suits your needs best. Most people like the dual stage one, but isn't really necessary to get the job done. For the cost of the Dual Stage one, you can almost buy an AVC-D

 

I've heard a lot of people like using the dawes mbc. I'm not 100% sure but I believe he makes the ball and spring type and its only $35.

http://www.dawesdevices.com