I went with a bigger actuator than the stock one. The one I went with was from Banks. I went with the elbow from Banks as well. It is the same elbow that Banks uses for the exhaust brake, but, without the brake installed. Those two things, along with the 4" exhaust, have brought the turbo to life. It boosts quicker, a little higher, and, keeps the boost going longer in the rpms. I could tell a difference, to say the least. One more thing I noticed, that little black puff of smoke you get when you hit the go-go pedal, it's gone.