So i just tuned my gt and i felt good about it. I only did 87 octane street because i forgot to tell my dad to put 93 in. Ive notice the throttle response and a whole lot smoother. When i floored the pedal ive noticed the engine revs higher and when it shifts, it shifts hard. Lol its not smooth but hard. When i refill, im retune it and program 93 race tune. Is there a big change between those two tunes?