So I had a Cobb RMM on my car for about 12k miles... My car is FBO (slow) and now the RMM is back to feeling loose like stock. When I first put it on it felt good but now it feels bad. What is the stiffest RMM I can get? Is there one that won't get looser over time? I'm about to get the x47r which I will be at 300whp so I need it to be stiff.... Thanks