Goin in for a retune on the stang. I put my stock mufflers back on and i keep getting rich lights in my car. I also have a friend that has been doing 8.8 mustang rearends for as many years as i have been alive, tell me it sounds like its my pinion depth thats off. ill tell you all what my numbers are with the retune later i dont think they will be better because i want to solve some fuel issues( too much) but who knows maybe we wil get to know that the stock mufflers perform well even under pressure.