i did the e fans, pcm, 160 thermostat, and made a better cold air intake at the same time, so its hard to say but i do notice the firmer shifts and it has alot less tq management in it, before it was a dog off the line now if i kick it down to first at a 5-10mph roll it will chirp the tires or if its wet out it will spin them, not too bad for a boat tower, mine has the 5.3 in it