Yes it does spool quicker and can make a little more boost. But before you buy one I'd suggest figureing out what you plan to do with your truck. If you don't think you'll ever install bigger injectors then get the .84 housing. It's smaller so it will spool up super quick! But anything bigger than stock injectors is going to overspool the turbo so you would want to just get a 1.0 housing or stay stock.