I hear you there. Boy I would love to ride in a vehicle equipped with the Van Manen Headers to get an idea of decibel level. My system is stock at the moment, but could benefit from something as it does have some loss in the mid to upper RPM range. I think the MAF-less tune from Evolve will certainly help out there, but I would like to have all of the exhaust components in place first so the tune can be done specifically for the bits and pieces on the vehicle. I understand they do custom tunes. Do you have any additional modifications to your drivetrain?