Hmm. Those look like divided housings - is your manifold divided also?

 

Here's a pic of our setup



http://www.gothamracing.com/catalog/produc...products_id=851

 

Yep - that's more or less what I did (not that specific manifold though). It wasn't sure if a single wastegate could be made to perform similarly, or exactly how to do it. Probably if you have long tubes running to the wastegate there wouldn't be enough "crosstalk" between the two exhaust ports, but I don't know exactly what it would take so I just did 2 gates. Gave a nice improvement in response.