I am a new user and have been browsing the forums and reading all the great info for my new 2006 Mustang GT. I have been adding some new mods and have ran across an issue that I was hoping someone here can help me out with. I have a 2006 GT 5speed with axleback exhaust, Steeda CAI with high flow elbow, with xcal 3 91 tune. I also have a NOS wet kit with 75 shot. My question is do I need a custom tune for the 75 shot of NOS or will my 91 tune suffice? Thanks for any help on this issue.