My car initially made 661rwhp in very cool weather I believe it was lower 60 can't remember, and now with a basic hand port and polish it made 681rwhp in 89 degree weather, so I'm happy with that!
Had a local shop here in Kissimmee Florida do it, price was stupid cheap and they did awesome! I was gonna a do it but by the time I dropped it off and picked it up they had it done in two days and it would have cost as much in tools as what I paid them haha