Has anyone had any experience with these in gas motors? Have several friends who have them in diesels but what about them in a gas motor? Good or bad I want to hear it, thinking of getting one for our 5.4 v8 in the expedition. We do pull a 16' plus v nose trailer. Will it make any difference? Not that its hurting for power but the guys we travel with have diesels and keep pushing me. Just looking for a little bolt on boost. Thanks