[Shane@DBPerformance]

Internal gates suck. Some have trouble with creep. Some have trouble holding high boost. Sometimes they make your boost wavier up and down. They start opening earlier than an external, so they are laggier. Internals normally only have one port on them, so you can't use boost to help hold them shut in higher boost applications. You could spend the same or more money in porting, fancy O2 housings, and the added cost of the internal gate itself to try to get it to work right instead of just mounting an external on the exhaust manifold collector.