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I have one of these Boost controllers and have had no problems out of it. I read that the stock spring rate was 7psi somewhere (I think on here or on SF). Right now I have my b setting set to 45% duty cycle which nets me around 9psi. They are very easy to install as I installed mine in about...

Here's mine. Had more but lost em somewhere.

Glad I found this thread. I need to check the one on my parts car. It has a knocking sound around 3000-3500 rpms or when under hard acceleration from those rpms. Maybe this is my problem instead of rod knock.

Just wanted to introduce myself. My name is Bill Wertenberger. I am from Southeast Missouri. I own a 1989 Toyota Supra Turbo with 91,000mi. on it. I hope to learn much more here than I did at SF. Thanks Bill.