Convert low pressure grill to high pressure grill

Something from Extend-a-Stay should work. I found the link below with some of their products:

http://www.amazon.com/extend-a-stay-propane-kit/cp/u6ad659emgby3qg

Regulators are relatively cheap. You'll need on somewhere before your grill. Most backyard grill have small ones either on the tank or at the grill housing.