Every car is different and so is every dyno but they're not nite and day different. Here's a video I found of a guy getting a baseline for his gt. https://m.youtube.com/watch?v=-Iz-fvGb_qs Go easy on the bolt-ons and cam swaps fellas. It's easy to wind up spending close to $2k on them and the end result being a 20 hp or less gain. Change out the mufflers so at least it'll sound fast. Then address the suspension and after that save you're money on a decent set of heads or a blower. I found out the hard way once upon a time.