I have a 09 challenger rt auto. I have a nitrous express wet single fogger kit. Im running a WOT switch along with a rpm window switch set for 3500 on and 5700 off. Im looking to run a 125 shot of nitrous. Im going to run colder plugs also. I have a diablo predator tuner and am running a 93 cai tune. I was wondering if i need to get a custom tune or can i just pull 4-5 degrees of timing in the diablo? Also with an automatic can you spray while shifting or should i spot in between each shift? Any info would be great thank you.