ZZP offers a flash tune that iv heard good and bad about it. I have a 00 regal gs when i bought the car it had the ZZP stage 2 3800 kit on it. which to my knowledge came with that flash tune on the pcm. I thought it was great the car ran perfect. then i put a snow water meth kit in it had it tuned by a shop in Colorado and we got more horse power out of her but idk if it was purely the water meth or the new tune it had. Now every time the regal goes into open loop the O2 sensor in bank one goes ape **** and the car feels horrible. any case im in the middle of a turbo build and tunning is coming up do guys think take it to a tune shop or let ZZP do it.