You and your good buddy can't agree on whose mod yields more power. You could go to the shop and get some raw numbers but WTF, you just spent a bunch of cash on your upgrade! You could also do it Fast and Furious style, but who really wants to end up in jail or for that matter, talk like Paul Walker (it's a joke man!). Best thing to do is to break out the Butt Dyno. It's cheap, easy and your buddies can't argue the numbers. Well, actually they can but you'll know it felt faster to you and that's almost as good as the truth. (Will not ship by Xmas)