The power valve needs to have a few washers grooved out to shim up power valve because the collar is too long. They know it and dont apparently care. The one in foreground is stock. If you dont have access to someone who can help you or equipment then it's a problem. I got mine through MXpowerplay and their customer service was outstanding. WSM won't do anything and won't respond to you pretty much at all. Buyer beware!!!